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 is from an old documentation of Radio Shack from the 70s. The transistor should...
When the power is cut off, this circuit keeps the flashlight on for a while, allowing it to be...
This circuit was obtained in an old Popular Electronics. It makes use of quite common components....