Call Sound Amplifier (CB21273E)

Found in an older Radio Electronics, this circuit generates signals that can be used with regular analog telephones.

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Simple blinker (CB6759E)
P1 on this Radio Shack circuit is a 6 V lamp with current up to 500 mA depending on Q2. The...
Touch Alarm (CB17032E)
This simple touch alarm, found in a 1995 documentation, uses common components and a triac to...
Micro Voltage Regulator (CB1577E )
With the micro voltage regulator shown in the figure, we can design a power supply for small...