Windshield wiper timer (CB6052E)

This windshield wiper timer was obtained in an 80's Hands On. The transistor can be the BC548 and the relay is 12 V sensitive. The time is set to R3.

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1 MHz XTAL Oscillator using the 7402 (CB787E)
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Stereo Headphones Amplifier (CB982E)
The circuit presented in the figure is an amplifier for stereo sources with the Maxim MAX9723...
General Purpose Preamplifier (CB4772E)
Circuits similar to this appear elsewhere in this section. The transistors can be BC549 (low...