This very high input impedance JFET circuit was found in the 1995 Encyclopedia of Electronic Circuits Volume 5. The JFET is a general-purpose transistor as is the output transistor.
Several analog TV channels operate with stereo audio signals, but the vast majority of receivers are...
Found in old documentation, this circuit uses components that are still common on the market. The...
The LED is optically coupled to the LDR1 sensor to provide negative feedback to the circuit and...