Protected regulator (CB8708E)

This 1965 Electronic Design circuit has short-circuit protection and is suitable for 20 V sources. Transistors are types of the time.

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Digital volume indicator (CB7008E)
Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an...
Colpitts Oscillator (MSB047E)
L1 and C1 determine the frequency of this Colpitts Oscillator. Refer to our section Mathematics...
High Output Voltage Amplifier (CB6179E)
This circuit is from Mullard 1969 documentation. The circuit operates at a relatively high supply...