This circuit is from an 80's publication. It makes use of small 6 V x 50 mA incandescent lamps. The diodes can be general purpose or even 1N4002. The transformer is 6.3 V with 100 mA or more current.
Thes astable was found in old publication of 1968. The circuit uses general purpose germanium...
We found this zener regulator in a 1978 radio amateur documentation. The operational can be...
One flip-flop of the 4018 can be used as a frequency divider or counter as shown here. Frequency...