Index
Misc power supply circuits
- Advanced polarity protection with MOSFETs - Advanced Power Switching and Polarity Protection for Effects Rate this link
- A Simple Capacitance Multiplier Power Supply For Class-A Amplifiers - A mentohd which providess good noise filtering but no actual voltage regulation Rate this link
- Circuit combines power supply and audio amplifier - This circuit can helpful if you must transfer dc power and audio over a pair of copper wires. The circuit uses only one IC, the well-known LM317, a low-cost power-supply regulator. Using this chip, you can modulate the adjustment-pin input with the audio signal from an electret condenser microphone, connected between the output and the adjustment terminals of the IC. Rate this link
- Clamping circuit dissipates minimal power - quasi-linear regulator Rate this link
- Drive high-voltage varactor diodes from just 5V - how to connect two International Rectifier (El Segundo, CA) PVI1050s photovoltaic-isolator ICs in series to provide a 20V tuning drive for the varactor diode Rate this link
- Electronic Fuse for Power Supply - This circuit offers effective protection against overcurrent in power supply with output voltage through to 45V DC and output current form 0.1A to 5A. Rate this link
- High-Current Transformer - For a surprise FREE high current transformer look to your 'junk' microwave ovens and recoild the secondary with thick wire. You can make easily a high current low voltage AC power source in this way. Rate this link
- High-Voltage EL Lamp Driver - The Supertex HV826 is a high voltage driver designed for driving EL lamps. The input supply voltage range is from 1.8V to 3.5V. The device uses a single inductor and a minimum number of passive components. The nominal regulated output voltage that is applied to the EL lamp is ?80V. Rate this link
- MOSFET replaces switch - you can use a single-pole switch to turn a bipolar power supply on and off without consuming extra power Rate this link
- Passive circuit limits inrush current - This passive circuit for inrush-current limiting uses commercially available components and presents advantages in size and cost. The resistance-switch arrangement inserted in series with the filter capacitor, instead of in the main power line, limits inrush current in this circuit. The current rating of the switch can therefore be much lower. Rate this link
- Power switch provides soft start - A series-connected MOSFETs turn on the line voltage near the zero-crossing point and off when the 555-timer delay lapses. That delay ranges from 1 to 7 msec. The MOSFETs' body diodes and the 1N4005 diodes form a full-wave bridge rectifier that provides a floating 12V-dc level via the 10-kohm, 3W resistor. Rate this link
- Quickly discharge power-supply capacitors - A perennial challenge in power-supply design is the safe and speedy discharge, or "dump," at turn-off of the large amount of energy stored in the postrectification filter capacitors. If you let the capacitors self-discharge, dangerous voltages can persist on unloaded electrolytic filter capacitors for hours or even days. This design idea gives one alternative approach for faster discharge than normal bleeder resistors provide. Rate this link
- Rectification using a Gyrator Circuit Rate this link
- RFB-01 - The ultra fast rectifier bridge - Some people feel that they need a faster rectifier bridge than the normal 1-50 ?s in 50/60 Hz applications. The rectifier bridge is built by four ultra fast recovery diodes plus four heavy duty polypropulene capacitors. Rate this link
- Series Lamp Limiter - connect a 100W lamp bulb in series with the supply to the equipment being repaired to avoid very nadty high short circuit current is something goes seriously wrong, useful for power supply testing and repairing Rate this link
- Smoke Detector Power Supply - This power supply normally supplied power from AC mains power source thrpgh transformer nad charges a battery. When AC mains power dissapears, the power is supplied from the battery. Rate this link
- Soft-Start Circuit For Power Amps - This circuit reduces the current spike large transformers take when switched on. Rate this link
- Soft Power On Tester for Amplifiers - The worst thing that can happen is that when you turn an electronics device you are fixing on, it immediately pops a fuse - or worse yet a valuable part you've just installed! If you don't have a variac with a current meter so that you can make power on gradual, the next best thing is this widget. It can be whipped up from parts in your local home supplies store. Rate this link
- Time-delay relay reduces inrush current - A transformer switching onto a line can sometimes cause a circuit breaker to trip or a fuse to blow. This phenomenon occurs even if the transformer presents no load, such as when the secondary is open. The problem arises because of the heavy magnetizing inrush current in the transformer. This design solves the problem in one way. Rate this link
- Transistors offer thermal protection for controller - You can use standard bipolar transistors to implement a low-cost thermal-shutdown circuit for switched mode power supply. Rate this link
- Transistor latch improves on/off circuitry - on/off circuitry commonly used in battery-operated devices Rate this link
- Versatile power-supply load uses light bulbs - Improvising loads for bench-testing and designing power supplies is often a frustrating and sometimes hazardous experience. Many electronic loads are on the market but are usually expensive and of laboratory-type precision and often represent overkill for the average designer. Incandescent light bulbs make excellent loads, able to handle large amounts of power. Moreover, they come in small packages and require no heat sinks. The drawback is that the resistance of an incandescent lamp changes dramatically with the power input. A simple approach to this control problem is to pulse-width-modulate a power MOSFET in series with the load. Rate this link
Misc circuits
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