This circuit was found in a 1968 RCA documentation. The circuit can be designed with operational equivalents. Input signals can be up to 6 V in amplitude and the limitation is 78 dB.
This circuit with passive components uses an LDR as a sensor. The potentiometer adjusts the...
The transmitter presented by our contributing reader Adriano Muniz Moura has a power of 10 watts...
This circuit for cars with fans was found in Silicon Chips documentation from the 90s. It is used...