This circuit is used in VHF and UHF superheterodyne receivers. The circuit is from the 1964 RCA transistors manual. Equivalent transistors such as the BF495 can be used.
This circuit was found in Philips documentation from 1967. The components are of the time, being...
The Variable Frequency Oscillator (VFO) shown in the figure can generate signals in a frequency...
This circuit uses an operational amplifier to modulate the light emitted by an LED with audio...