Active three-tone filter (CB20808E)

This circuit was found in an American documentation and can be added to common amplifiers of any type. The transistor can be any general purpose.

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Audio Limiter (CB24757E)
This low distortion circuit was shown in the July 1983 issue of Radio Electronics magazine. The...
Pramplifier mixer with tone control (CB9034E)
Settings like to this can be found elsewhere in this section. This was found in an American...
UJT and SCR Timer (CB1520E )
This traditional timer setting can provide time intervals up to a few tens of minutes. The...