This circuit is from a 90s Radio Electronics. The resistors must be precision types and the transistor is a general-purpose type. The operational admits equivalent.
This circuit uses an MW radio tuned to around 540 kHz to detect atmospheric signals, for example, from...
This circuit is intended to maintain constant current in a heating element. This element must have...
The LMV321 is a low voltage operational amplifier from ON Semiconductor. The following diagram,...