Today we come to see a Negative Voltage Regulator circuit. Before we use the just positive regulator as Simple DC regulator using transistor and Zener. The output voltage of this circuit is 12.6V.
We use PNP Transistor be main electronic parts. By it is used as the character of emitter follower or voltage follower, make have a high current of about 0.7 Amp.
Simplified schematic diagram of 12.6V Negative Voltage Regulator using PNP Emitter Follower
Next, the pulsating DC is filtered by C1-1,000uF capacitor.
And then, the electric current flow to a filtering regulator circuit. They include R1, ZD1, ZD2, R2, and Q1. Next, the R1-resistor will limit current to both ZD1, ZD2-Zener diode. Then, The Zener diodes are used as a specific reverse breakdown voltage across them is 12V(constant voltage).
Next, this low current flow base Q1 to increase current up, now ready to load.
The capacitor C2-2200uF help give the circuit to the stability increasingly.
For other detail see in a picture.
Parts will you need
Q1 : TIP42 or equivalent (100V 6A, PNP transistor), Quantity: 1
ZD1, ZD2: 6V,0.5 watts Zener Diode, Quantity: 2
D1-D2 : 1N4007, 1A 1000V Silicone Diode, Quantity: 2
C1: 1,000uF 35V, Electrolytic Capacitors, Quantity: 1
C2: 2,200uF 35V, Electrolytic Capacitors, Quantity: 1
R1: 220 ohms 1/2W Resistors tolerance: 5%, Quantity: 1
R2: 1K 1/4W Resistors tolerance: 5%, Quantity: 1
F1: 0.5A Fuse, Quantity:1
S1: ON-OFF Switch(SPST Switch), Quantity:1
T1: 0.5A, 12V Center Tap Transformer
Related Negative Voltage Regulator
- Simple Zener diode voltage regulator circuits
- 9V regulated power supply circuit using transistors and zener
- Basic DC voltage Regulated 13V low current
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