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 found in the used integrated circuit manufacturer's manual. The table beside the...
This circuit makes use of germanium transistor, but can be mounted with a silicon transistor like...
This circuit is intended to indicate the operation of transmitters with powers above 5 W. The...