We found this circuit in an old Popular Electronics. The circuit is experimental, driving an LED from signals applied to the LDRs. The power supply does not have to be symmetrical.
This circuit switches a load in 0.013 ms after closing the switch and after the start of each...
This circuit can be powered by 2 or 3 small batteries. The resistor can have values between 220...
The purpose of this circuit is to test power supplies functioning as a variable load that can...