This receiver uses old transistors that are equivalent to BC548 and BC558. The photo diode is of any type. The receiver can be used on a highly sensitive audio link.
This very high input impedance circuit is suggested by Texas Instruments. The circuit can be...
Found in Unitrode documentation, this oscillator uses some unusual components today such as PU and...
Other operational amplifiers in the series, such as the MC34072, MC34074, MC35071, MC35072,...