This is a battery powered 3W power amplifier using germanium transistors. The circuit is from an English documentation from 1967. The transistors are from the time.
This circuit allows modulating a laser diode with low frequency signals. The integrated circuit...
This AC amplifier using the 741 operational amplifier uses a dual supply from 5 to 12 V. The input...
This circuit is suggested by the Optoelectronics Sourcebook by Texas Instruments when AC signals...