This astable multivibrator was obtained from a Mullard documentation from 1960. The components depend on the used transistor and on the frequency, as shown in the table next to the diagram.
In the figure we have an audio amplifier suitable for portable applications in both mono and...
This small transmitter was found in a 1988 publication, but it can be easily assembled today. The...
This circuit is from an April 2000 Poptronics. The magazine no longer exists, but the circuit can...