Microphone Amplifier (CB6204E)

This amplifier was found in a 1969 Mullard documentation. The circuit uses transistors that have as modern equivalents the BC548 and BC549.

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Long Term Delay (CB5153E)
We find this circuit in a 1980s documentation. The circuit uses uncommon components today which can...
Four Octaves Electronic Organ (CB1437E)
We found this circuit in a 1977 Radio Shack documentation. The circuit should be powered, for...
Digital Gain Control for Operational (CB15010E)
With the circuit shown in the figure it is possible to digitally control the gain of an...