**
Variable Symmetrical power supply 0 a 30V - 5A**

**
Circuits Divers / Various Circuits**

**Boost Buck XL6019**

**
The circuit need a resistor of 40 ohms, R = 40.**

Total resistor Rn of R1, R2 and R3 must be 40 ohms -->

1/R = 1/R1 + 1/R2 + 1/R3 = 3/Rn

Rn = R * 3

Rn = 40 * 3 = 120 ohms

Here R = Rn / 3 = 120 / 3 = 40 ohms

**For R you need 1 watt per empere. **

Here 3 x 1 watt = 3 watt for 3A.

**For 4A you need 4 resistors of 1 Watt. **

R1, R2, R3 and R4. Rn = 40 ohms x 4 = 160 ohms, 4 x 1 watt = 4 watts.

**Or**
For 4A you need 2 resistors of 80 ohms 2 Watt or 1 resistors of 40 ohms 5 Watt.

**
For 5A you need 5 resistors of 1 Watt. **

R1, R2, R3, R4 and R5. Rn = 40 ohms x 5 = 200 ohms, 5 x 1 watt = 5 watts.

**Or**
1 resistors of 40 ohms 5 Watt.

**TIP122, TIP127 Pinout**

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