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1.5V to 5V Converter - In many cases can be very handy to be able to convert 1.5V
to 5V. Then you can power microcontroller or LED from a single AA or AAA battery. It
is simple to do this as there are special IC�s as MAXIM MAX1674 or MAX7176. This is
step-up DC-DC converter that can convert voltages from 0.7V to any in range from 2V to
5.5V. MAX1676 have already preset pins for 3.3V and 5V, that makes easer integration
in 3.3 and 5V circuits. IC can dissipate up to 444mW. ….(electronic schematic added
11/08) |
|
10W HF Linear Amplifier - (circuit / schematic design added 6/06) |
|
12 Volt to 9 Volt DC Converter - Car Converter for12 Volt to 9V (Tony van Roon's
electronic design added 4/02) |
|
122 Volt AC Lamp Dimmer Full Wave SCR - (circuit / schematic design added 6/06) |
|
123 VAC Lamp Dimmer (full wave SCR) - The full wave phase control circuit below
was found in a RCA power circuits book from 1969. The load is placed in series with
the AC line and the four diodes provide a full wave rectified voltage to the anode of
a SCR. Two small....(electronic diagram added 6/06) |
|
12V DC to 220V 100W Inverter with 4047 IC & IRF540 - This is 100W inverter
circuit. It uses 4047 IC and IRF540 Mosfet instead of 2N3055 transistor. Power output
is 100W from 2-3A transformer. ….(electronic schematic added 11/08) |
|
12V Fluorescent Inverter - Build this 20 watt Fluoro Inverter, it drives two
20-watt tubes or a 40-watt tube!….(electronic circuit added 04/09) |
|
12V to 110V/ 220V 500W Inverter - Using this circuit you can convert the 12V dc
in to the 220V Ac. In this circuit 4047 is use to generate the square wave of 50hz and
amplify the current and then amplify the voltage by using the step transformer. How to
calculate transformer rating The basic formula is P=VI and between input output of the
transformer we have Power input = Power output For example if we want a 220W output at
220V then we need 1A at the output. Then at the input we must have at least 18.3V at
12V because: 12V*18.3 = 220v*1 So you have to wind the step up transformer 12v to 220v
but input winding must be capable to bear 20A. ….(electronic schematic added 11/08) |
|
12V to 120V Inverter - Have you ever wanted to run a TV, stereo or other appliance
while on the road or camping? Well, this inverter should solve that problem. It takes
12 VDC and steps it up to 120 VAC. The wattage depends on which transistors you use
for Q1 and Q2, as well as how "big" a transformer you use for T1. The inverter can be
constructed to supply anywhere from 1 to 1000 (1 KW) watts. ….(circuit design added
11/08) |
|
12V to 120VAC inverter - (Tony van Roon's schematic added 6/07) |
|
12V to 220V 100W Inverter - This is a simple 100W inverter that can be used to
achieve 110V or 220V from 12V. Circuit uses 2N3055 output transistors that are easily
available. Output voltage depends on the type of transformer being used. ….(circuit
design added 11/08) |
|
12W AC-DC Flyback converter - Fully assembled and tested power supply with DC
containing all design documentation Features: Universal AC line input, 0-1A Iout @
12V, 84% efficiency at high line, Short Circuit protection, Over Voltage protection
(added 3/05) |
|
18v AC to DC Power Supply - This is a classic linear power supply which produces a
regulated 18v, rated at about 1 amp. (added 7/06) ….(designed by David A.
Johnson) |
|
240VAC To 5VDC Power Supply - This is simple way to power some 5v logic from a
240vac source. If a 120vac power adapter is used, the circuit will also work for
120vac power lines. ….(designed by David A. Johnson) |
|
3W HF QRP Linear Amplifier - (circuit / schematic design added 6/06) |
|
500mW HF Linear Amplifier - (circuit / schematic design added 6/06) |
|
500w HF Linear Amplifier - (circuit / schematic design added 6/06) |
|
500W Mos-Fet Power Inverter from 12V to 110V/220V - This circuit will provide a
very stable "Square Wave" Output Voltage. Frequency of operation is determined by a
pot and is normally set to 60 Hz. Various "off the shelf" transformers can be used. Or
Custom wind your own FOR BEST RESULTS. Additional MosFets can be paralleled for higher
power. It is recommended to Have a "Fuse" in the Power Line and to always have a "Load
connected", while power is being applied. The Fuse should be rated at 32 volts and
should be aproximately 10 Amps per 100 watts of output. The Power leads must be heavy
enough wire to handle this High Current Draw! ….(design added 11/08) |
|
50V 3A Stabilized Power Supply with 2N3055 - Many times we needed a stabilized,
together regulated power supply and high relatively output voltage. These
specifications him it cover our circuit. It 's a circuit that can give in his exit +
40V until + 60V 3A, with simultaneous stabilization. The materials that use is very
simple and will not exist difficulties in the manufacture, is enough you are careful
certain points. 1 ] For output voltages smaller of + 50V until + 40V, the Q1 is hot
enough, so that it needs one big heatsink. ….(design added 11/08) |
|
6 to 12 Volt Converter (Aaron Cake) - This circuit can provide up to 800mA of12V
power from a 6V supply. The circuit is simple, about 75% efficient and quite useful.
(added 08/08/08) |
|
600 Volt Power Supply - simple 600 Volt DC power supply. Convert 230V AC to 300V
and 600V DC. . (added 9/04) |
|
60w Ac-DC Flyback Converter - Universal AC line input Fully assembled and tested
power supply with DC containing all design documentation Features: 0-4A Iout @ 15V,
87% efficiency at high line, Short Circuit protection, Over Voltage protection
(added 3/05) |
|
80V Linear Regulator is Micropower - DN314 Design Notes (Linear Technology)
(app note added 2/06) |
|
90W AC-DC Flyback converter - Fully assembled and tested power supply with DC
containing all design documentation Features: Universal AC line input, 0-6A Iout @
15V, 83% efficiency at high line, Short Circuit protection, Over Voltage protection
(added 3/05) |
|
AN-1148: Linear Regulators: Theory of Operation & Compensation - National
Semiconductor Application Note (app note added 2/06) |
|
AN-262: Low-Noise Low Drop-Out Regulator for Portable Equipment - AN-262 Analog
Devices Application Note (app note added 2/06) |
|
AN-60-004 Ultra-Linear 50W Amplifiers 20-512MHz LZY-1 - Application Note
MiniCircuits.com (app note added 2/06) |
|
AN-60-005 Ultra-Linear 32W Amplifiers 500-1000MHz LZY-2 - Application Note
MiniCircuits.com (app note added 2/06) |
|
AN-60-009 High IP3, wide band, balanced linear power Amplifier HELA-10 -
Application Note MiniCircuits.com (app note added 2/06) |
|
AN-D10: Off-Line Compact Universal Linear Regulator - Supertex Semiconductors
(app note added 2/06) |
|
AN-D14: LP07 Series: Low Dropout 3.0 Volt Linear Regulator - Supertex
Semiconductors (app note added 2/06) |
|
AN-H22: Customizing the Linear Circuitry Response of HV91 - Supertex
Semiconductors (app note added 2/06) |
|
AN-H40: High Voltage Linear Regulator & Constant Current - Supertex Semiconductors
(app note added 2/06) |
|
Apex-AN35 PWM AC/DC Power Supply Design - 12/1999, AN35UREVA : 332 Kb (Apex App
Note added 08/08/08) |
|
Automobile Interior Light Fader - This circuit is similar to the fading eyes
circuit above and is used to slowly brighten and fade interior lights of older cars.
The circuit is based around the LM324 low power opamp which draws around 3mA of
current, so it won't bother the battery if left connected for extended
periods....(circuits added May 2009) |
|
Bidirectionall power inverter - 08/02/01 EDN-Design Ideas: If you want to swap
charge in either direction between unevenly loaded positive and negative battery
buses, you need an inverting dc transformer. One implementation is the symmetrical
flyback converter shown in Figure 1. The circuit can generate a negative
output.....(design idea added 09/03).....(design idea added 09/03) |
|
Caps Provide Voltage Boost To Series Regulator - This circuit adds some capacitors
and diodes to a traditional transformer type series regulator circuit to extend the
normal operating range. It can insure regulation during low line voltage conditions or
it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply.
….(designed by David A. Johnson) |
|
Circuit Forms Constant Current SCR - 02/01/01 EDN-Design Ideas:.....(design idea
added 6/06) |
|
Circuit offers improved active rectification - 02/06/03 EDN-Design Ideas:
Rectifiers convert ac signals to dc. You can combine a diode and a load resistor to
create a half-wave rectifier, provided that the amplitude of the ac source is much
larger than the forward drop of the diode (typically 0.6V). Unfortunately, you can't
use this method to rectify signals that are smaller than a diode drop.....(design idea
added 1/05) |
| Classic Plus & Minus DC Power Supply - This is a
classic example of a regulated DC power supply that produces both a positive 15v and a
negative 15v from a 20vac wall adapter. ….(designed by David A. Johnson) |
|
CMOS hex inverter generates Low distortion sine waves - 06/09/05 EDN-Design Ideas:
Audio signal source uses hex inverter and handful of passives.....(design idea added
11/05) |
|
CMOS inverters convert RF to Digital signal - 01/05/06 EDN-Design Ideas:
Hex-inverter-based design suits frequencies up to180 MHz.....(design idea added 10/06) |
|
Customizing the Linear Circuitry Response of HV91 - Supertex Semiconductors
(app note added 2/06) |
|
DC to DC Converter - The circuit below is a DC to DC converter using a standard 12
VAC center tapped power transformer wired as a blocking oscillator. The circuit is not
very efficient but will produce a high voltage usable for low power applications. The
input battery voltage is raised by a factor of 10 across the transformer and further
raised by a voltage tripler consisting of three capacitors and diodes connected to the
high voltage side of the transformer.....(circuit added 7/02) |
|
EPR-32: 25 Watt Multiple Output TOP245P Supply - This design kit is an AC-DC power
supply with universal input and 4 outputs. The design, rated for 20 W (25 W peak), is
implemented using a TOP245P device from the TOPSwitch-GX IC family and an EEL25 core
in a flyback topology. (added 3/05) |
|
Fast Rectifier Circumvents Input Level Effects - 12/22/94 EDN-Design Ideas: All
diode-based rectifier circuits suffer from a signal-level-dependent frequency
response. This response occurs because the dynamic impedance of the diodes varies as
the signal level changes. The result is a slower frequency response and distorted
rectified outputs at low signal levels compared with high levels. An alternative
approach.....(design idea added 3/03) |
|
Full wave rectifier operates to 200 MHz - 07/20/95 EDN-Design Ideas: The circuit
in Figure 1 uses current-feedback amplifiers to implement a wideband full-wave
rectifier for applications such as a control/AGC system reference or as an amplitude
indicator. Putting the full-wave-rectifier diodes in the feedback loop of an op amp
works better than does using simple diode-based rectifiers. The op amp's loop
gain.....(design idea added 10/05) |
|
High Efficiency Linear & Switching Solutions for Splitting a Digital Supply -
DN172 Design Notes (Linear Technology) (app note added 2/06) |
|
High Efficiency Linear Regulators - AN32 Linear Technology Presents circuit
techniques permitting high efficiency to be obtained with linear regulation.
Particular attention is given to the problem of maintaining high efficiency with
widely varying inputs, outputs and loading. Appendix sections review component
characteristics and measurement methods. |
|
High IP3, wide band, balanced linear power Amplifier HELA-10 - AN-60-009
Application Note MiniCircuits.com (app note added 08/08/08) |
|
High Speed Rectifier uses No Diodes - 03/03/03/95 EDN-Design Ideas: Fig 1 shows a
high-speed, full-wave rectifier-or absolute-value circuit-that uses a high-speed
clamping amplifier, IC2. This circuit is faster and performs better than rectifiers
employing diodes in their amplifiers' feedback paths. These diode-based circuits have
limitations at lower signal-input levels and higher bandwidths. These
limitations.....(design idea added 03/03/03) |
|
High Voltage Linear Regulator & Constant Current - Supertex Semiconductors
(app note added 2/06) |
|
Introduction to Schottky Rectifiers - MicroNote 401 from Microsem (app note
added 6/06) |
|
LB-8: Precision AC/DC Converters - National Semiconductor Application Note
(app note added 2/06) |
|
Linear regulator=Low cost DC/DC converter - 06/13/02 EDN-Design Ideas: The circuit
in Figure 1 is a good choice if you need a power supply with high efficiency and you
don't want to use expensive dc/dc-converter ICs. The heart of the circuit is IC1, the
common, inexpensive LM7805 linear regulator. The external switch is a pnp transistor;
the circuit can easily source more than 1A output current.....(design idea added
10/03) |
|
Linear Regulators: Theory of Operation & Compensation - National Semiconductor
Application Note (app note added 2/06) |
|
Low Power 12,000 Volt Power Supply - If you need about 12,000 volts DC for an ion
generator this circuit might be the ticket. It draws power from the 120vac power line
but it uses a small 6KV camera flash trigger coil. The output signal is isolated from
the power line. Although the circuit can only deliver about 5uA of current it can
produce dangerous shocks, so be careful. ….(designed by David A. Johnson) |
|
Low-Noise Low Drop-Out Regulator for Portable Equipment - AN-262 Analog Devices
Application Note (app note added 2/06) |
|
LP07 Series: Low Dropout 3.0 Volt Linear Regulator - Supertex Semiconductors
(app note added 2/06) |
|
Miniature Isolated AC/DC Power Supply - This circuit uses a novel approach to
produce a fully isolated and regulated 5 volts @30ma from the 120vac power line. It
uses two tiny SCRs that alternately discharge two capacitors through a miniature high
frequency transformer. The voltage spikes produced through the transformer are
rectified, filtered and regulated. A very common 8 ohm audio impedance matching
transformer can be used for the transformer. Published in EDN, Feb. 17, 1992
….(designed by David A. Johnson) |
|
MOSFET Switch Provides Efficient AC/DC Conversion - 02/17/00 EDN-Design
Ideas:.....(design idea added 6/06) |
|
Motor Accu Lader (Dutch language) - (circuit design added 08/09) |
|
Non-isolated Off-line AC to DC Power Supply - This compact efficient circuit can
provide up to 100ma of a regulated 5 volts from an AC power source ranging from 20vac
to 120vac. ….(designed by David A. Johnson) |
|
Off-Line Compact Universal Linear Regulator - Supertex Semiconductors (app
note added 2/06) |
|
Off-Line Power Supply Does Not Require Filtering to Meet FCC Emission Requirements
- DN175 Design Notes (Linear Technology) (app note added 2/06) |
|
One 9 Volt Battery gives +18 +25 +33V - This circuit is based on MAX1044 is a
charge pump converter. (added 4/02) |
|
One Watt 2.45 GHz Linear Amplifier - (circuit / schematic design added 6/06) |
|
OpAmp Rectifier Signals Input State - 07/21/94 EDN-Design Ideas: The op-amp
rectifier in Fig 1 operates from a single supply and provides a logic output and an
LED that indicate the state of the input voltage. The input-state indications are
handy for calibration. Because the circuit operates from a single supply, the 2.5V
reference determines the level around which the circuit rectifies input
waveforms.....(design idea added 6/03) |
|
Output Adjustable Flyback Converter - (electronic diagram added 6/03) |
|
Precision AC/DC Converters - National Semiconductor Application Notes,28-Jun-1996
(app note added 4/02) |
|
Precision full wave Signal rectifier needs no diodes - 09/01/05 EDN-Design Ideas:
Single-supply design uses two op amps.....(design idea added 11/05) |
|
Precision Rectifier is Glitch Free to 1 MHz - 05/12/94 EDN-Design Ideas: The
manufacturer’s circuit for a precision, current-mode, full-wave rectifier (Fig
1a)converts a voltage signal to a current, eliminating errors arising from voltage
drops across the rectifying diodes. However, just like op-amp-based rectifiers, the
circuit i.....(design idea added 3/03) |
|
Precision Rectifier Reduces Ripples - 03/03/97 EDN-Design Ideas: You can use a
lowpass filter to simultaneously increase a rectifier's speed and reduce or maintain
the ripple voltage. The input voltage of the precision rectifier in Figure 1a is 100
mV at a frequency of 50 Hz. The output with C1 equal to0 is a double phase-rectified
voltage of R2/R1.....(design idea added 3/03) |
|
PWM AC/DC Power Supply Design Apex-AN35 - Apex App Note (added 08/08/08) |
|
Rectifier tracks positive & negative peaks - 06/08/06 EDN-Design Ideas: Versatile
precision rectifier also delivers full-wave output.....(design idea added 05/06/07) |
|
Run Switching Type AC Power Adapters on DC - I have received a couple emails from
people looking for inexpensive DC to DC converters, which can convert 40v to 60v DC
into say +5 or +12v. Such input voltages are often found in new automotive and
industrial applications with a typical DC voltage of 48 volts. It turns out that many,
not all, but many, standard AC line operated power adapters, which use switch mode
techniques, will indeed work great when supplied with DC instead of AC. The unit below
works down to about 30v DC and delivers 500ma at 5v. If you draw less current, it will
operate at even lower DC input voltages.... ….(designed by David A. Johnson) |
|
SCR Voltage Regulator - Though not as accurate as a linear or a high-frequency
switching regulator, an SCR voltage regulator wastes little power and creates no RFI.
Designed by Andrew R. Morris (added 6/06) |
|
Silicon Controlled Rectifier Model Railroad Throttles & London Model Railroad Group
SCR Throttle - The following is a schematic drawing of a Silicon Controlled
Rectifier type throttle for use on larger scale model railroads. Three versions of
this throttle are shown on this page. They are not sophisticated designs but work well
and are tough and reliable. (added 2/05) |
|
Step Down Rectifier Makes a Simple DC Power Supply - 04/09/98 EDN-Design Ideas:
-- A simple and useful nonisolated rectifier features voltage step-down operation,
acceptable Class A line-current harmonics, inherent short-circuit protection, and,
optionally, a regulated output.....(design idea added 3/03) |
|
Supply uses AC to generate 5V Power on reset - 05/16/02 EDN-Design Ideas: The need
often arises for a low-cost logic supply for powering microcontrollers and related
circuitry in "white-goods" products, such as industrial controllers and sensors. These
applications usually include 24 or 115V ac or higher levels of ac voltage for
conversion to 3.3 or 5V dc. The simplest approach to generating
low-current.....(design idea added 02/05) |
|
Thermostat for 1KW Space Heater SCR controlled - Here is a simple thermostat
circuit that can be used to control a relay and supply power to a small space heater
through the relay contacts. The relay contacts should be rated above the current
requirements for the heater. Temperature changes are detected by a .... (added
6/06) |
|
Transformerless Mains Power Supply - This power supply does not really excel in
power efficiency, but it is the cheapest and most compact solution for a small power
supply. Note that the low voltage output is directly connected to the mains; it cannot
be used when the low voltage part can be touched. With the component values of the
schematic, the circuit can supply12V /15mA max. (added 4/02) |
|
Transformerless Power Supply (Aaron Cake) - (electronic circuit added 7/03) |
|
Transformerless Power Supply (jose pino) - Simple, low cost and easy to build
power supply. Ideal for applications that doesn't requiere too much power. (5/28/2006) |
|
Transformerless Power Supply (Len Galasso) - This power supply uses the reactance
of a non-polarized capacitor at 60hz to step-down the voltage from the normal 117VAC
level to about 20 volts or so, which is rectified by the diode….(circuit design added
7/06) |
|
Transformerless Power Supply (Ron J) - This circuit will supply up to about 20ma
at 12 volts. It uses capacitive reactance instead of resistance, so it doesn't
generate very much heat. The circuit was desigusing an optically-isolated triac....
(added 6/03) |
|
Transient Protection of Darlington gain block Amplifiers - AN-60-034
Application Note MiniCircuits.com (app note added 08/08/08) |
|
True RMS Detector - National Semiconductor Application Notes,28-Jun-1996 / (app
note added 6/02) |
|
Two OpAmps Make Fast Full Wave Rectifier - 03/14/96 EDN-Design Ideas: The circuit
in Figure 1 is a precision full-wave rectifier with the following characteristics:
Minimal delay time between the input and output (with only one op amp in the chain);
Similar delay times for positive and negative inputs; No need to match diodes or
adjust resistors. When VIN>0V, the output of op amp IC1 is negative, so
….....(design idea added 2/06) |
|
Ultra Low Drop Linear Regulator - (circuit / schematic design added 6/06) |
|
Ultra-Linear 32W Amplifiers 500-1000MHz LZY-2 - AN-60-005 Application Note
MiniCircuits.com (app note added 08/08/08) |
|
Ultra-Linear 50W Amplifiers 20-512MHz LZY-1 - AN-60-004 Application Note
MiniCircuits.com (app note added 08/08/08) |
|
Unregulated power supply - A basic full wave rectified power supply is shown
below. The transformer is chosen according to the desired load. For example, if the
load requires 12V at 1amp current, then a 12V, 1 amp rated transformer would do.
However, when designing power supplies or most electronic circuits,....(schematic
added 6/07) |
|
Uses & Advantages of MERA Dual Matched MMIC Amplifiers - Application Note
MiniCircuits.com (app note added 08/08/08) |
|
Using the Catalog Specifications to Determine MMIC Reliability - AN-60-030
Application Note MiniCircuits.com (app note added 08/08/08) |
|
Very Low Dropout VLDO Linear Regulators Supply Low Voltage Outputs - DN292
Design Notes (Linear Technology) (app note added 1/06) |
