This an old commercial receiver found in a year 1958 magazine. The circuit uses some transformer available that timer and the transistors are germanium types. The circuit is intended to receive MW stations.
With this circuit found in a 1965 Electronic Design, it is possible to read a peak voltage of up to...
This ultra-simple polarity indicator uses common green and red LEDs and can work with 3 to 9 V...
This circuit activates a relay when the sensor receives light. The sensor can be any common LDR,...