Suitable for audio signals in electronic music, this circuit was published in the September 1973 issue of Radio Electronics magazine. The transistors were general-purpose types at the time.
This circuit was found in a 90s American documentation from the 90s. The components are from that...
The search coil of this detector consists of 140 turns of wire 18 in an 8 inch diameter form. The...
This circuit was found in a Popular Electronics from the 90s. Transistors admit equivalents, as well as...