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.
This circuit was obtained in an Argentine publication in 1976. It consists of a series voltage...
This protection circuit was obtained in a 1969 Electronic Design. The SCR can be the current...
With this circuit published in Radio Electronics magazine in September 1959, it is possible to use a...