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Charge Pump Efficiently Divides Supply Voltage
This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value. . . Circuit by David A. Johnson P.E.-July, 2000
Charge Pump Generates Positive Bias
03/02/95 EDN-Design Ideas Placing the averaging filter inductor in the output return leg of an isolated forward-converter power supply can significantly reduce the common-mode noise the supply generates. This technique can eliminate some of the high-frequency spikes present on the output voltage__ Circuit Design by Steve Mowry, Siemens Industrial Automation, Johnson City, TN
Charge pump with ultraLow quiescent current
08/05/04 EDN-Design Ideas Portable battery-powered devices often spend most of their life in standby mode, in which the quiescent current of an internal boost converter continuously bleeds the battery. The quiescent current during standby can be larger than__ Circuit Design by Greg Sutterlin, Maxim Integrated Products, Sunnyvale, CA
Charge pump-logic voltages of 3-5 volts.
A charge pump uses arrays of capacitors to increase voltage in a circuit. In this way, you can drive higher voltage loads from logic voltages of 35 volts. __ Designed by Bruce Robinson
Charge-pump divides by two
02/18/99 EDN-Design Ideas NOTE
: Collection of Design Ideas, scroll to find this one. Small size and efficiency approaching 100% make switched-capacitor charge pumps popular for voltage doubling and inverting in miniature dc-dc applications. Few are aware, however, that most charge pumps can halve as well as double or invert an input voltage. The increasing adoption of low-voltage logic makes this ÷2 capability useful for generating low-voltage supplies in portable equipment.__ Circuit Design by Budge Ing, Maxim Integrated Products, Sunnyvale, CA
Charge-pump topology doubles voltage, breaks DC path
EDN-Design Ideas 08/09/2016 This unusual charge-pump voltage multiplier Design Ideas not only doubles the input, but has a pseudo-floating output__ Circuit Design by Michael Dunn
Circuit provides 5V gate bias from –48V
09/19/02 EDN-Design Ideas A small and simple circuit derives 5V from the -48V rail that telecomm applications typically use (Figure 1). Useful for gate bias and other purposes, the 5V supply delivers as much as 5-mA output current. A shunt reference__ Circuit Design by William Hadden
CMOS
Inverter 125khz LC Oscillator
This circuit uses a single CMOS
inverter to form a series resonant LC oscillator. The values shown set the oscillation at about 125KHz but the other frequencies are possible by changing the main LC values. . . Circuit by Dave Johnson P.E.-March, 2002
CMOS
Inverter forms a Resonant LD Oscillator
This circuit uses a single CMOS
inverter to form a series resonant LC oscillator. The values shown set the oscillation at about 125KHz but the other frequencies are possible by changing the main LC values . . . Hobby Circuit designed by Dave Johnson P.E.-March, 2002
CMOS
Inverters Form 125Khz Oscillator
This circuit inverts the LC components so the inductor is grounded. Two inverters are needed to produce the needed oscillation. Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2002
CMOS
Nand Gate Forms Gated 125Khz Oscillator
This circuit is uses a NAND gate as an inverter. The gate allows the oscillator to be gated on and off. Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies. . . Circuit by David A. Johnson P.E.-March, 2002
Converter Generates 3.3V from Two or Three Cell
11/21/96 EDN-Design Ideas Generating 3.3V from two or three cells poses a design challenge. The regulator must step down the voltage when the cells are fresh but step up the voltage when the cells are semidischarged and weak. One solution to this problem is a flyback-transformer__ Circuit Design by Robert Badalian, Maxim Integrated Products, Sunnyvale, CA
Digital noise generator
When you need to test an audio circuit with broadband noise, this circuit works great. It uses just three inexpensive C-MOS ICs that generate a series of output pulses whose widths vary randomly. I included a level control pot . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2000
Exciter Circuit-12v Touch Switch
This circuit generates a 20KHz pseudo sine wave signal that can power approximately 50 remote touch activated switch circuits. This hobby circuit can support a cable length of approximately 2500 feet. A typical remote switch circuit is also shown as . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002
FETs & Logic Devices Divides Supply Voltage on Charge Pump Efficiently
This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2000
Flexible Outputs from Square Wave Driver
This circuit can produce an output signal ranging from DC to 100KHz. It can source a voltage ranging from 1v to 30v. It can sink a voltage ranging from zero volts to –30v. It can drive up to 200ma of current and can even be switched to a floating tristate . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2000
Fluorescent Lamp Night Light Needs Only 1 Watt
If you are tired of replacing small night light lamps, try this circuit. The line powered circuit uses a long life cold cathode fluorescent lamp. A simple charge pump technique runs the lamp without any transformer . . . Hobby Circuit designed by David Johnson P.E.-March, 1999
Fully Isolated 50/60hz Sync Generator
This circuit will produce a single pulse at the zero voltage cross points of the power line voltage. An opto-coupler provides a very safe 5KV isolation . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2004
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