12VDC Negative Voltage DC Converter by 555

Tuesday, February 26th, 2008

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The circuit is very simple, and is easily made on Veroboard or similar. Construction is not critical, and the schematic is shown in Figure 1 below.
Rectifier diodes should be ultrafast (UF4004 or similar), or you can use 1N4148 signal diodes. Losses will be slightly higher if you use signal diodes, or lower if [...]

Split Supply Generator 5V to 9V and -4V

Monday, February 25th, 2008

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A dual power supply to power a circuit that is operating with signals near or at ground but the only available supply is a single polarity, usually positive. Many excellent IC solutions are available but a suitable solution for many projects may be constructed from “junk box” parts. The simple circuit below will generate about [...]

Fairchild Power Switch

Friday, January 4th, 2008

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The PWM controller features integrated oscillator to be synchronized with the external sync signal, under voltage lockout, optimized gate driver and temperature compensated precise current sources for the loop compensation. This device also includes various fault protection circuits such as over voltage protection, over load protection, abnormal over current protection and over temperature protection.
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