1 W amplifier (CB8948E)

This circuit was obtained in a 90s American documentation. The integrated circuit used is uncommon today. The circuit has a low RFI level.

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5V x 5 A Step-Down Regulator LM78S40 (CB14406E)
The circuit is from the 1994 National Semiconductor Linear Applications Handbook. The component used is...
Audio Relay (CB23686E)
This circuit activates a horn from an audio signal. This can be used for remote control via audio...
Temperature interface (CB20543E)
This temperature sensor shield or interface was found in a PC English documentation from 1996....