This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with modern equivalents. Output transistors may be BD135 and 136 with heatsinks.
This circuit is connected to the sum key of a common calculator. Adjusted to produce a pulse per...
This circuit was published in an English magazine from 1980. The magazine no longer exists, but...
This oscillator was found in a 1967 General Electric documentation. The UJT is P-channel, an unusual...