10-Step Sine Generator (CB24472E)

This CMOS generator with the 4018 IC was found in a November 1976 Radio Electronics magazine. It uses a 741 op-amp as the audio amplifier.

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Dark switch (CB8254E)
This circuit was found in a 1967 Philips documentation. The circuit fires when light stops hitting the...
Sound Roulette (CB16966E)
We found this circuit in a 1990 documentation. It draws one out of 10 numbers and during the draw...
Phonograph Preamplifier LM381 (CIR25278E)
This preamplifier for magnetic cartridges was found in the February 1990 issue of Radio...