Circuit schematic Negative Voltage Power Supply using IC LM555

PowerSupply. - Here is Circuit schematic Negative Voltage Power Supply using IC LM555. As we know that A negative supply can be generated by a “Charge-Pump” circuit created with a 555, diodes and capacitors.

Another advantage of this circuit is that, the negative voltage together with the original positive supply can be used to simulate a dual supply. This circuit diagram like in figure 1 below shows how to obtain a negative voltage from a positive voltage supply.

Figure 1. Circuit schematic Negative Voltage Power Supply using IC LM555
(Source: www.electronicecircuits.com)

Component List

• C1 0.1µF (104)
• C2 0.022µF (223)
• C3 22µF 25V
• C4 33µF 25V
• C5 100µF 25V
• R1 4.7kΩ
• R2 33kΩ
• D1 1N4002
• D2 1N4002
• IC1 NE555

The Original Article : "555 Negative Voltage Power Supply"