This circuit for frequencies of 20 to 2 kHz was obtained in English documentation from 1966. The transistor can be any general purpose and powered by batteries.
The circuit we use makes use of Linear Technology's LT3080 (www.linear.com) which consists of a...
This microcontrolled null adjustment for operational amplifiers was obtained in a Linear...
This is the receiver circuit for the previous transmitter. The circuit has a programming key to...