Found in 1967 documentation, this circuit makes use of period transistors and drives a common light bulb. Nothing against it being adapted to use LED.
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...