Signals of up to a few tens of kilohertz can be generated by this circuit found in a European publication from the 1980s. Transistors admit equivalents and the unijunction can be 2N2646.
This is the receiver for the CB17133E. Its main feature is that it uses only transistors. The...
This integrator circuit uses the junction FETs which can also be the BF245 or MPF102. The...
Found in a Philips documentation from 1967, this circuit is intended for applications with...