This is an old test circuit for integrated TTL counters, feeding a Nixie tube, common at the time. The circuit is from the 90's, not being given the power supply.
The input resistance of this circuit is 60k and the pass band from 20 to 20kHz. The circuit is...
This effect circuit for guitar and guitar was found in a 1974 documentation. The circuit has...
This circuit was found in documentation from the 70s. The transistors are from that time, but the...