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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Ignition Switch Alarm Oscillator (CB15049E)
This circuit was found in an American publication from the 1980s. The transistor can be the BD135...
Alarm with NC Switches (CB4805E)
This circuit was obtained from old documentation and has a very simple 6 or 12 V configuration...
Card reader (CB8282E)
Found ina 1970 American documentation this fast-reading circuit uses a photodiode. Transistors...