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 filters low frequency noise from the turntable motor. We found it in a 1989...
The circuit shown in the figure is recommended for applications where a visual indication is...
This circuit was found in an English magazine from 1978, but it is still current, just change the...