This circuit is based on the light comparison of two LDR sensors. We found it in a 90s Popular Electronics. The transistor must be according to the indicator or load being driven.
This high voltage circuit was found in a 2005 Linear Technology application manual. The circuit...
With this circuit we can activate a relay with a simple touch on the sensor. The relay can be 6 or...
What sets this transmitter apart, which we found in a 1990 documentation, is the modulation by the...