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Power Supply Regulator 0.1-50V 1A
by IC CA3130 , CA3086 , 2N3055

The MOSFET input of the CA3140 makes it ideally suited for use in a high impedance DC voltmeter. Switch S1 is the range selector. The input impedance is limited to 10M by the resistors used in the voltage divider, but this is still a very acceptable value. Before switching on for the first time, [...]

Circuit Light Change Detector by IC CA3130
This the Secretariat of the Swith light high-quality circuit. By prominent its point is when the light changes the system will order to give Relay work immediately. Detect the change in the light that get from the circuit is will that. We use IC op-amp number CA3130 [...]