Found in a Maxim publication from the 90s, this circuit generates signals from 10 to 25 kHz with a THD better than -80 dB. The circuit makes use components of the time.
Found in EEE documentation, this circuit can have the duration and frequency adjusted separately....
The circuit presented was found in a Japanese magazine in 1973. The circuit uses transistors of...
This General Electric circuit is from the 80's. The PUTs used in this meter are not common...