This game was found in Radio Electronics from the 90s. The components used are common except some that are from that time and that can no longer be found easily.
This circuit is from a Radio Electronics magazine from August 1990. The indicator module is of a...
This flip-flop using two bipolar transistor was found in a publication of the year 1968. The...
This TTL siren is formed by two oscillators using each two Gates of a 7400. Frequency or the...