Suggested by a 90’s Radio Electronics, this circuit automatically activates the recording switch of an old tape recorder. It can be adapted for other purposes.
The purpose of this circuit is to excite a TTL input with lz pulses. The phototransistor can be of...
We found this circuit in a Motorola publication from the 70s. The circuit can be implemented with...
This circuit with the LM741 operational amplifier can be applied to other operational amplifiers. We...