This circuit was obtained in a 1967 Electronics World. The components are still common today, the SCRs can be replaced by equivalents and the unijunction transistors the 2N2646.
This circuit was found in a 1980s US publication. There may be some difficulty in obtaining the...
May 2017 - The new 36V TLVx171 Series of General Purpose Operational Amplifiers from Texas...
We found this circuit in a Popular Electronics of the 80's. The circuit can be used to drive...