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 solar cell driven circuit makes 4 LEDs run at a speed given by capacitor C2. The circuit is...
This circuit is from an English technical documentation and can be implemented with BC558...
The voltage of this symmetrical power supply depends on the regulating integrated circuits, which...