We found this circuit in documentation from the 1980s. The transformer is of the low voltage type with a 1: 3 turn ratio and the transistors can be of general-purpose types.
We found this circuit in the semiconductor ON manual using couplers of the time. These components...
VU or Volume Units is a sound intensity indicator that can be installed on any stereo. The...
This circuit was originally designed for medical applications and biological experiments. The...