CMOS Mixer (CB9033E)

This touch-controlled circuit was found in English documentation from the 1970s. The components used are common today.

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LM381 52 dB Amplifier (CB25276E)
This non-inverting AC amplifier was found in the February 1990 issue of Radio Electronics...
LM381 Tone Control (CB25278E)
The diagram shows a tone control with the LM381 IC. The circuit is from a Radio Electronics from...
0 to 100 degrees Celsius Thermometer (CB1486E )
This circuit uses a common diode as sensor. The output goes from 0 to 10 V with the temperature change in...