This circuit was found in a Popular Electronics from the 90s applying to common automotive signaling lamps. The circuit can be adapted to LEDs.
With the circuit shown, when the brightness of one lamp decreases, that of the other increases. There is...
We find this circuit in a 1970 publication. Transistors can be replaced by current equivalents and LDR is...
We find this battery charger in a 90's Hands-On Electronics. The charging current is 2 A and when...