This circuit, which appears in other versions on this website, was obtained in old documentation. The load of each PUT depends on its characteristics. The circuit is low frequency.
This circuit was found in a Mullard transistor manual from 1960. Note the symmetrical power...
This amplifier step with a transistor has an input impedance of 100k to 10 M. The transistor can be any...
I found this little signaling transmitter in old American documentation. The circuit has a good...