We found this circuit in an 80's manual. The same configuration can be adapted to make use of modern operational amplifiers. The power supply is symmetrical.
Found elsewhere in this section, but from other sources, this circuit is from a 1964 Electronic...
This two-transistor circuit is from a December 1964 Radio Electronics. Modern transistors can be...
This receiver can tune in the 3 to 12 MHz band with good sensitivity and selectivity, using a good...