This circuit is from March 1978 Radio Electronics. The 4-digit circuit uses a period module and is battery powered. The main integrated circuits are CMOS and TLL.
Operatives used in this 80's configuration are not common today, but it is valid for modern...
The 5 outputs of the internal 4018 integrated flop flops can be used simultaneously for the...
This voltage-controlled potentiometer using an LDR was found in an English documentation. LDR is...