The circuit presented is a Japanese commercial radio from the 1960s. With a 4.5 V supply, it is a super-heterodyne type with an IF of 455 kHz. 6 germanium transistors are used.
Other operational amplifiers series, such as the MC34072, MC34074, MC35071, MC35072, MC35074 d...
We can use this amplifier with low impedance headphones with good performance. Possible...
This circuit was found in the May 1989 issue of Radio Electronics magazine. The circuit requires a...