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 was obtained in a 2001 Poptronics. The magazine no longer exists in its printed form,...
This circuit is from March 1978 Radio Electronics. The 4-digit circuit uses a period module and is...
This circuit was found in an old documentation from Europe. The integrated circuit used is...