Sinusoidal Oscillator (CB9189E)

This circuit was found in an Elektor from the 90s. The circuit uses common components even today, requiring a symmetrical power supply.

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High Impedance Instrumentation Amplifier (CB15879E)
The circuit in the figure is based on two integrated LM108 and its gain is basically determined by the...
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Car Amplifier (CB24019E)
This amplifier stage was equipped with a Motorola radio from the 70s. The transistors were from...