This simple metronome, from 1985 documentation uses only transistors and has two settings. For voltages above 6 V, up to 12 V, replace the BC557 with a BD136.
This is a bridge for the measurement of low value resistances and high values too. The circuit...
This circuit was found in Radio Electronics magazine from April 1961. The device has a slot for...
We found this circuit in an English publication. The transistor can be a BC558. The instrument can be...