Peak Indicator (CB20736E)

This circuit triggers an LED when the input signal exceeds the peak, or the value set in RV1. The transistors can be the modern equivalents BC549.

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Current Regulator (CB15842E)
The L200 integrated circuit consists of a 5-terminal current regulator in a TO-22O enclosure that...
Dynamic Microphone Amplifier (CB4729E)
This is a circuit that appears several times in this section and in articles. It is a preamplifier for...
Transistor Radio 6C8 (CB18433E)
This receiver for the AM band with 6 transistors was manufactured in the 60's in Japan. The power...