This old fashioned transistor amplifier was found in a publication of the year 1958. Transformer are the critical components in the circuit and power comes from 6 D cells.
The integrated circuit used is equivalent to the 555 and the transistor can be the BC558. R1 and...
This configuration, which appears in the manual of other manufacturers, is an excellent 1.5 V...
This simple timer based on unijunction and SCR transistors is from 1995 documentation. The maximum...