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.
This ultra-low frequency receiver circuit was published in the August 1973 issue of Radio...
Maxim MAXREFDES67 Universal Analog Input Micro PLC is ideal in factory automation because of its...
The sensor of this circuit is an NTC with a resistance between 200 and 1000 ohms. The resistor R1 must...