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How I can modify my power supply (5V, 8V) to adjust to 0-12 V?

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Hobby-MCS

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Hi. I have one power supply it can be output voltage 12 V . But I have the toy that use voltage 5 V , 8 V . How I can modify my power supply to adjust 0-12 V

Urgent..
 

12 volt adjust power supply circuit

hi Hobby-MCS
I think you mean are the circuit which connect after your power supply and varia ble see circuit below
**broken link removed**
....................................
Resource :www.electronics-circuit.com
 

lm317 0-12v

This uses LM317:
**broken link removed**
 

0 12 volt adjust power supply

If you use LM317 the minimum output voltage will be 1.25V.
But if you need the output to be adjustable between 5V and 8V then LM317 is a perfect choice.
Bye!!!
 

lm317 0-12v regulated supply

You can use some zeners to regulate the voltage
 

how to use lm317 output 12v

Hi friend,


Here is the shematic of the regulated power supply

https://obrazki.elektroda.pl/82_1173334995.gif


Here is the component list:
F1 - 2A fast acting fuse
R3 - 4700 Ohms Potentiometer
F2 - 250mA fast acting fuse
C1 - 4700uF/35v
S1 - SPST (Single Pole Single Throw) Switch
C2 - 1uF/35v
T1 - Transformer 3 Amp (Primary 120/220 VAC/Secondary 9-0-9 VAC)
C3 - 1000uF/35v
U1 - LM 317 Voltage Regulator IC
One heatsink with a surface area of at least 3 inches by 3 inches.
U2 - Bridge Rectifier 4A 100PIV
One Voltmeter with a range from 0 to 30 VDC.
R1 - 220 Ohms 1/2 Watt
One Ampmeter with a range from 0 to 1.5 Amps.
R2 - 1700 Ohms 1/2 Watt
 

lm317 0-12v

Hobby-MCS, as you need only +5V and +8V power supply while you got in hand the +12V power supply, so:
- you need not to have a 0...+12V adjustable power supply.
- LM317 is the best choice here, and note that using LM317 with your +12VDC power supply, you will get only +1.25...+9V adjustable power supply, but it is good enough.

The circuit for this purpose you can find out in LM317 datasheet, National Semiconductor. Very simple and easy.

Alternatively, you can use 2 ICs L7805 and L7808 separately to get 2 independent +5V and +8V output posts. Of course, you will need more room for the circuit.

nguyennam
 

0-12v regulator

Use dc-dc converter regulator LM2576-adj
You can provide the IC with input range 7Vdc to 40Vdc,
and adjust your output accordingly.
Energy efficient solution.

**broken link removed**

Hope this helps.
 

lm317 0-12

Yes LM317 is the right choice.The resistor at the output and adjust pin at the LM317 also can be replaced by using variable resistor.
 

0-12v dc regulator

LM317 is a very good and simple solution to make an adjustable supply.
 

317 voltage regulator 12v

LM317 is a good choice ..It can provide around 1.5A of current also...
 

dc voltage adjuster circuit

If you need a true 0-12V output, a chopper circuit would be a good choice.

A chopper is a circuit that breaks the 12VDC into a series of pulses. The pulses generally occur at a rate above human hearing (>20khz), and are then filtered through a simple lowpass filter to pass only the average (DC) value to the output. The output voltage is dependent on the width of the pulses. Ex. if the duty cycle of the pulses was 50%, the output would be 6V.

This type of circuit is more difficult to design than the LM317, so if you don't need the 0-12 output, I would use the LM317.
 

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