Simple Universal PIC Programmer

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This simple programmer will accept any device that’s supported by software (eg, IC-Prog 1.05 by Bonny Gijzen at http://www.ic-prog.com). The circuit is based in part on the ISP header described in the SILICON CHIP “PIC Testbed” project but also features an external programming voltage supply for laptops and for other… Read more »

5V Power Supply For On-Train Radio Camera

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A radio camera on a model railway should transmit constantly while the train is moving and continue transmitting for a few minutes after the train stops. But if the train starts up again after a relatively long halt, imagery should be transmitted immediately. Consequently, the power source for the camera… Read more »

Electronic Fuse Employs A Relay

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While many power supplies can be set to limit their output current to a defined level, to protect the circuit they are powering, no such protection is available if you are powering a circuit from a battery. If a fault develops, the circuit can blow before you have a chance… Read more »

TV Muter Circuit

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Many households are still graced by tube-type television sets. If you want to connect one of these large tellies to your stereo system to improve the sound quality, this is usually not a problem because there are plenty of SCART to Cinch adapters available in accessory shops. However, with some… Read more »

Adjustable voltage source regulator integrated circuit 7805 positive + Operational amplifier 4558

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Here is a basic voltage source circuit in 7805 but adjustable, need a continuous supply unregulated, a filter capacitor, an integrated 7805 + 1 operational amplifier 4558 Adjustable voltage source regulator parts list : R1 : 10Kohm C1 : 100nF C2 : 330nF C3 : 10uF U1 : 7805 U2A… Read more »