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.
This circuit was obtained from a 1994 publication. Its purpose is to digitally switch 5 audio...
The circuit shown is from the National Semiconductor's Linear Applications Handbook. The CI is not...
In this charger, the charging current is basically limited by the LEDs. The transformer is a low...