This circuit divides the frequency of a 2 kHz signal by 2. The circuit was found in Philips documentation from 1964. Modern transistors can be used for higher frequencies.
We found this circuit in a publication about operational in the 90s. The circuit is based on the...
We found this circuit in the 1960 Mullard transistor reference manual. The phototransistor can be a...
This small receiver for the medium wave range was found in Radio Electronics magazine from July...