Using 4 operational amplifiers this circuit generates 4 different tones. The circuit is from an American documentation from the 90's. Operational amplifiers are tTL084.
Operating at just 1.35 V this circuit was found in a 1969 Electronic Design. The circuit makes use...
This input circuit for meters, which can also be used as a shield, is intended for operation with...
This vox was found in Hughes documentation from 1968. The circuit uses components from the era. A...