This circuit is from an English documentation from 1969. The circuit can be designed based on modern equivalent transistors. Diodes are general purpose types.
This general-purpose transistor amplifier stage was found in the November 1993 issue of...
This conventional 4 channel circuit with the 4017 and 555 was found in the November 1991 Radio...
We find this circuit in an old technical documentation. The circuit can be drawn up with other...