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Running 12V Fan Directly on 220V AC - This circuit idea is certainly not new, but when it comes to making a trade-of between using a small, short-circuit proof transformer or a capacitive voltage divider (directly from 230 V mains voltage) as the power supply for a fan, it can come in very handy.__ Learning Electronics
Safety Guard-Simple Circuit unit, Protects home appliances from voltage spikes - Protect your home appliances from voltage spikes with this simple time delay circuit. Whenever power to the appliances is switched on or resumes after mains failure, the oscillator starts oscillating and D5 blinks. This continues for three minutes. After that, Q14 output of IC CD4060 goes high to trigger the gate of the SCR through D4. At this moment, the voltage is available at the cathode of the SCR, which energizes the relay coil to activate the appliance and D6 glows. Switch SW1 is used for quick start without waiting for delay.__ Learning Electronics
Schmidt trigger - Article is in Dutch __ Designed by Jan Hammer
Schmitt trigger adapts its own thresholds - EDN Design Ideas: 03/16/2015 if you need to condition a widely-varying signal, a simple Schmitt won’t work, but this DI will Design by Anthony Smith
Schmitt Trigger: an unusual - This is a Schmidt unlike any you have seen before. it has some unusual properties - some of which are distinct advantages, some are disadvantages. There is no 'best circuit' - different ways of doing a particular function have different uses. __ Designed by Richard Torrens
SCR phase control yields solid-state switch - 03/15/01 EDN Design Ideas: SCRs (silicon-controlled rectifiers]/ PDF contains multiple circuits scroll to find the one of interest, or thyristors, have higher current and voltage ratings, lower conduction losses, and more robustness than TRIACs. For these reasons, SCRs are better suited to high-power applications Design by James Keith
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
SCR-Controlled Eht Power Supply - Presented here is an extra-high-tension (EHT) power supply capable of delivering variable DC voltage from about 100 V to 5 kV with load current up to 500 mA. One way of...__ Electronics Projects for You
Self-powered Fast Battery-Tester - This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. it has two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1 is switched to the other position, only 1.5V cells can be tested. __ Contact IQ Technologies
Simple 0...24v/2A Power supply - Ham Radio - Power Supplies __ Designed by Guy Roels ON6MU
Simple Circuit 3.3 volt power supply - Among the power supplies presented here, this is a well regulated type that can deliver up to 1.5A current from a wide range of input voltage of 5V to 25V dc. See LM317 calculator if you want to know how to get the 3.3 V output. __ Designed by KB Kaminski
Simple Circuit Inverter - This circuit will provide a fairly stable "Square Wave" Output Voltage. Frequency of operation is Mainly determined by the 220 uF Feedback Caps. Currently about 60 Hz. Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec
Simple Circuit Switching Power Supply - This is a Somewhat Experimental Circuit and I Especially designed this circuit for those persons that want to Dabble in Switching Power Supply Designs.
This Circuit is based on a UC3843 integrated Circuit. It does Not allow for Feedback control of the output voltage. __ Designed by G.L. Chemelec
Simple Circuit switching power supply - could a switcher be designed that would use parts available from ANY Radio Shack or well-stocked junk box? i'm happy to report the answer is YES! __ Designed by Donald L Burdette
Simple Circuit switching regulator (experimental) - This is an experimental circuit which rapidly "chops" a steady DC input voltage to produce a lower output voltage. Regulation is a function of the chopping - it is caused by the output transistor switching on and off around the target voltage, which when smoothed provides a constant DC output.__ Rowan from Melbourne, Austrailia
Simple Constant Current Source - This simple constant current source uses an LM317 regulator IC . N. B. The pin-outs of the IC are not a mistake, the output is taken from the adjustment pin. I found this circuit to charge all my NIC ad batteries, and I use a Kambrook mechanical light-timer (or equiv.) for 110vac to time the charge __ Designed by John Nooyen
Simple Universal AC or DC Amplifier with Opa452/Opa453 & Transistors - introduction During the experiments with loudspeakers, systems with loudspeakers, transformers, public announcement systems, audio distribution lines and amplifies, etc, we are in need of audio amplifier capable of providing more than 60Vpp...__ Electronics Projects for You
Single to 3-phase power conversion - The single phase 220 VAC input is brought in on lines 1 and 2, labeled L1 and L2 in figure 1. Time delay cartridge fuses are used for short circuit protection.1R-1 and 1R-2 are the main contacts for the magnetic contactor (power relay.) The coil for this relay is denoted 1R. The run capacitors are wired between lines 1-3 and lines 2-3. The overloads are part of a thermal overload relay with a normally closed contact labeled OL-1. This contact will open if any overload is tripped. Opening this contact disables the flow of current through the 120 VAC control circuit deenergizing the coil 1R. The idler motor terminals are labeled T1, T2, and T3 __ Designed by John - K3PGP
Small 2.5-50V power supply for universal use based on a LT1074 - This project describes a little power supply, based on a LT1074, adjusteable from 2.5 to 50 V, delivering much more than 1 Amp. __ Designed by Alexander C. Frank, aka Ajarn Changpuak
Small power supply for universal use based on an LM317 adjustable regulator - This project describes a little power supply, based on a LM317, adjusteable from 1.25 to 30 V, delivering approx.1 Amp. Yet another nice to have building block :-) __ Designed by Alexander C. Frank, aka Ajarn Changpuak
Small Variable power Supply - Features: 1.3-12.2 V, 1 A, over-current protection. This is a simple but reliable device based one of the oldest integrated voltage regulators of them all - the LM723. __ Designed by Aaron Cake
Solar charger for lead-acid batteries. - This circuit is still under development, but works well as shown. This circuit is intended for charging lead-acid batteries with a solar panel. The customary diode that prevents the battery from discharging through the solar panel has been replaced by a FET-comparator combination. The charger will stop charging once a pre-set voltage (temperature compensated) has been reached, and recommence charging when the voltage has dropped off sufficiently. The load is disconnected when the baterry voltage drops below 11V and reconnected when it gets back to 12.5V. __ Contact IQ Technologies
Solid State Relay - Solid State Relays are available almost everywhere these days, however they remain very expensive. Therefore, your efforts to build one yourself pays off. Especially since it only needs a handful components and the circuitry is simple and straightforward __ Designed by Jan Hamer
Solid State Tesla Coil/High Voltage Generator - This is a fun and useful circuit for demonstrating high frequency high voltage. it can produce up to about 30KV, depending on the transformer used. it is cheap and easy to make, thanks to the standard TV flyback transformer used. it can power LASERS (although I have never tried) , demonstrate St. Elmo's fire, and even cause a fluorescent bulb to light from as much as 2 feet away. __ Designed by Aaron Cake
Solid-state voltage indicator with high voltage cutout - Voltage fluctuations in the mains are very common phenomenon. These fluctuations can cause heavy damage to costly electronics and electrical gadgets operating for long period of time. For such purpose, an automatic stabilizer is used which is usually quite expensive.__
Stabilized Power Supply with Short Protection - Here is an efficient 4-stage stabilized power supply unit for testing electronic circuits. it provides well regulated and stabilized output, which is essential for most electronic circuits to give proper results. The circuit provides an audio- visual indication if there is a short circuit in the PCB under test, so the power supply to the circuit ‘under test’ can be cut-off immediately to save the valuable components from damage. __
Step Down a Negative Voltage Without using an Inductor - When you need to step down a negative voltage in a lowcurrent application, a non-inductor configuration offers two advantages: ease of use and a low number of external components. Such step-down converters can be implemented __ Designed by Budge Ing and Ben Wolde
Step Down Rectifier Makes a Simple Circuit DC Power Supply - 04/09/98 EDN-Design Feature (Several circuits included. Scrol to find this one) A simple and useful nonisolated rectifier features voltage step-down operation, acceptable Class A line-current harmonics, inherent short-circuit protection, and, optionally Design by Nathan O Sokal, Design Automation Inc, K Kit Sum, Consultant, and David C Hamill, Surrey Space Centre
Student DC Power Supply - Build a simple DC supply having three output terminals: regulated +5VDC, unregulated +10VDC and 7.5VAC. The supply is suitable for microcontroller experimenting. __ Designed by Wichit Sirichote
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 logic-supply levels is to apply the rectified and filtered ac in Design by Greg Sutterlin, Maxim Integrated Products, Sunnyvale, CA |
