This circuit appeared in Amateur Radio Today in an issue and was found in a 1995 issue. The circuit is for the AM band up to 3 MHz. The transistors are general-purpose.
This pocket radio for the medium wave band was found in the Radio Electronics magazine of January...
Other operational amplifiers of the same series can be used on this circuit found in Motorola's Linear...
This is the normal configuration of the LM12 as a high voltage amplifier. The LM12 consists of a...