Ripple Filter (CB6724E)

This circuit was found in a Delco 1965 publication. Transistors may be current equivalents according to the desired output voltage and current.

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Voltage Doubler (MSB021E)
Figure 1 shows a hal-wave voltage doubler operating with the Power-supply voltage. Output current...
Audible Direction Indicator (CB17986E)
Older cars and some modern models do not have an audible direction indicator. This simple circuit can...
FM Transmitter with a Tunnel Diode (CB12230E)
This micro FM transmitter uses a tunnel diode as an oscillator. I found it in an English...