Color	Full Set No TIP3055 PCB
Full Set No TIP3055 PCB

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Item specifics

Origin Mainland China

Product Description

The adjustable power supply board DIY kit is best for accessories that have idle transformers in your hand, Or modify the old power supply, use its casing, transformer, meter and other accessories. If there are no spare transformers and other accessories in hand, it is strongly recommended to buy second-hand finished power supply! Save peace of mind, effort and money! ! ! In addition, this power supply is a previously linear adjustable design idea, The output protection circuit is not perfect, and it is limited to amateur study and application in experimental occasions! Do not use it to power valuable electronic equipment! ! !

1. The power supply DIY has high requirements on the comprehensive electronic capabilities! ! ! This shop does not provide any technical support, please be careful! ! ! 3. Circuit diagram: If you need high-definition, please let the customer service pass the PDF file. 1. Please install 1A fuse for AC 220V incoming line 2. Please also carefully solder carefully, the component polarity must not be reversed, especially the big electrolysis! Try to stay away from the motherboard for the first time! Prevent the electric liberation cannon incident caused by various welding errors! ! ! The voltage and current potentiometer must be welded and contact firmly! ! ! If the potentiometer is disconnected during use, there will be 30V voltage and 5A current output! ! ! The circuit component parameters are designed for 30V5A, please do not change the output voltage and current at will! ! ! 3. The kit does not need to bring your own: (1) 150W-180W transformer (current 5A) Can be customized to specify the required 3 voltage output values 15V 23V 31V (5A) Add a double 12V to 15V current 1A winding to make a transformer, It is most suitable to disassemble the machine with a bad power supply. Or the power amplifier disassembles the current 5A from dual 12V to dual 15V. Add a 15W small transformer. (2) Voltage and current meter head (3) Two TIP3055 heat sinks, (4) 12V0.2A cooling fan (5) Cabinet and red and black binding posts Simple circuit description: L1 is the auxiliary control power supply,Transformer with center tapped dual 12V to dual 15 voltage and current 1AThis L1 winding is best wound around a transformer with the main power supply. The transformer at hand does not have such a windingYou can also use an independent small transformer,However, it needs to be switched on and off with the same switch as the L2 main transformer.L2 is the main voltage output, which requires more power. 150W--180WWhen outputting 30V, the suitable tap voltage is 0V-15V-23V-31V. Current 5A(Note that the voltage after rectification should be within 50V! Preferably within 40V !!!)The main voltage transformer can also be used with 150W commonly used middle tapped double 13V double 14 double 15 and current 5AThe three wire ends of such 5A dual output are connected to the first three terminal blocks in sequence,The fourth terminal block is empty. At this time, the relay RL2 is not installed,And also need to short the normally closed 2 pins of RL2. There is a picture below.25V2200 * 2 or 3300 * 2 for auxiliary control supporting electrolysis7.5K in the circuit diagram of the main voltage bleeder resistance is replaced by 2K 3W * 2 50V2200UF * 3 for main voltage filtering (total capacity should not exceed 6600uF) The 2 external potentiometers that regulate the voltage and current can be replaced by a stable and reliable multi-turn adjustment! (Interpretation of changes: When the load is open or lightly loaded, there will be a relatively large overshoot when the original circuit is shut down. 1. To reduce the bleeder resistance of the main filter capacitor, 7.5K is reduced to 2k. 2. The purpose of increasing c1 and c2 to 2200uf or 3300uf is to control the power retention time of the circuit capacitor to be longer than the power retention time of the main filter capacitor, so as to avoid the loss of control circuit (auxiliary circuit) and the output voltage of the main circuit will be out of control 3. The voltage potentiometer will output the highest voltage after poor contact or disconnection, please replace the higher quality potentiometer as much as possible. Attachment: Disassembly machine multi-winding transformer wiring reference diagram:

Below is an adjustable power disassembly transformer, the main winding is 0-12.5-25.5-3.3A directly available. The voltage of 33.5V winding is too high after filtering, you can put the 0-28.5V 3.3A winding, 0V connects to the 0V terminal on the board, 28.5V connects to the 35V terminal on the board The auxiliary winding is dual 19V 1A, which can be used, but the voltage is too high! 25V2200Uf should be replaced by 35V R13 680 Euro also need to increase the wattage! ! ! It's too hot! ! !

The circuit diagram is as follows:

全插件主板，尺寸10*10CM

套件的全部：

焊接参考图：

Use an idle dual 11.5V 3A main output transformer at hand to make a 0-25V 0-3A adjustable,

11.5V-0-11.5V is connected to 1 2 3 line post in sequence, the line post 4 is empty. Double 15V 1A connects to auxiliary 3P seat.

Equipped with peripheral accessories as shown:

note! Do not refer to the 1602 digital header wiring! ! !

It is a voltage and current test line. Not the same as the dual-display digital header

The correct connection method of the dual display head is:

OUT + and OUT- on the board are the main power output connected to the red and black binding posts

The A + A- terminal is connected to the thick red black of the digital meter, and the 5V output next to 7805 is connected to the thin red black line of the meter

The small yellow line V + connected to the thin yellow wire of the meter can also be directly welded to output Out + (V- is connected to the negative of the pointer meter)

NTC is connected to the thermistor FAN is connected to the cooling fan

Peripheral connection diagram:

Responsibility statement:

Since the product is provided as a kit, the kit also needs to be assembled by itself, including electronic components soldering, circuit debugging, etc. are complex actions that rely on experience.

This kit provides all components and circuit schematics, but the transformer, housing, voltage and current meter need to be prepared by the user! The user must understand that failures due to unsuccessful assembly may be caused by various unexpected reasons and bear the losses on their own.

Electronic products are closely related to electricity, please confirm your purchase according to your electronic production capabilities,

This kit does not provide any technical support, please carefully read the kit schematic diagram and related debugging instructions before purchasing, and confirm that you can complete the independent debugging before buying, thank you for your cooperation!

About the principle, characteristics and use of adjustable constant voltage and constant current power supply:

The principle of constant pressure and constant current:

According to U = IR, R = U / I:

If R> (U / I), the power supply is working normally.

If R <(U / I), I is constant, then the power supply constant current part is protected, and the output voltage drops until the condition R = (U / I) is met.

characteristic:

The so-called constant voltage, that is, the voltage can be constant to a value, adjustable constant voltage, that is, this constant voltage value is adjustable.

The so-called constant current, that is, the current can be constant to a value, adjustable constant current, that is, this constant current value is adjustable.

use:

The adjustable constant voltage constant current power supply needs to set the constant current protection value before use, and then set the output voltage, and then start working.

First adjust the output voltage of the power supply to about 5V, short-circuit the output, adjust the current output knob to set the protection current to the value you need, cancel the short circuit, adjust the voltage to the required value, connect the experimental equipment and start working.

For example, the working voltage of a circuit is about 0.3A at 12V, and the operation is as follows.

Adjust the output voltage of the power supply to about 5V, short circuit output, adjust the current output knob to set the protection current 0.5A (slightly larger than the operating current), cancel the short circuit, adjust the voltage to 12V, connect the circuit and start the experiment.

If the circuit board is placed on the metal during the test, part of the circuit is short-circuited, so that the current increases sharply. When the current rises to 0.5A, the power supply constant current protection part works even if the output voltage drops to protect the test equipment.

Common sense:

After the AC voltage is filtered by the full-wave rectifier capacitor, the DC voltage is approximately 1.414 times the AC voltage.

For example, the AC voltage of 10V is filtered by a full-wave rectifier capacitor and the DC voltage is approximately equal to 14V. Selection of relay switching point:

The AC input voltage minus 5V is equal to the switching voltage.

For example, transformer tap 0-15V-25V-35

Then the switching voltage of the first stage is 15V-5V = 10V, that is, switching to the 25V tap at 10V.

The switching voltage of the second stage is 25V-5V = 20V, that is, it is switched to the tap of 35V at 20V.

Regarding whether the relay is switched or not, it can be judged by measuring the voltage across R17. The voltage of R17 (DC) divided by 1.414 is approximately equal to the current tap voltage (AC).

Preparation before commissioning:

After the installation is checked and checked (the output terminal capacitor and diode must be installed; TIP3055 must be installed on a large radiator), if you do not connect the ammeter, please short-circuit the ammeter contact "A", and then power on.

Please refer to the schematic diagram:

Measure C1, C2 voltage, it should be normal at 12-25V.

Measure C11 voltage, less than 30V is normal.

Measure C15 voltage, 12V is normal.

If the above voltage is abnormal, please check whether the transformer is powered, whether the taps are connected incorrectly, and whether the components are installed incorrectly. Repeat the above steps until the voltage is normal.

Commissioning process:

Adjust VR3 and VR4 so that the voltage of pins 2 and 6 of U2 chip is above 10V

(Reference pin 4 of U2 as a reference point).

The voltage across R17 should be the voltage after the first-stage tap rectification and filtering of the transformer.

The A-RP current knob is adjusted to the middle, and the constant current indicator LED1 should not be lit.

Adjust the V-RP, the voltage can be adjusted around 0-18V (R17 voltage) is considered normal.

The output voltage is adjusted to the voltage of the first stage relay switching point

(If you don't understand, see "Selection of Relay Switching Point" above), adjust VR3 to make RL1 pull in, RL2 should not pull in at this time, and the voltage of R17 should be the voltage after the second-stage tap rectification.

The output voltage is adjusted to the voltage of the second-level relay switching point (see "Selection of Relay Switching Point" above), adjust VR4 to make RL2 pull in, and the R17 voltage should be the voltage after the third-stage tap rectification.

Adjust the output voltage to see if the two relays will pull in near the switching point. Repeat the above steps if you can't pull in, and continue to pull in.

Adjust V-RP to see the voltage output range. Adjust V-RP to maximize the output voltage. If the maximum voltage is not 30V, adjust VR2 to make the maximum voltage 30V.

Adjust the constant current:

First make sure that the adjustment tube has a large enough radiator and the heat dissipation is good.

Adjust the voltage to 5V, use the ammeter to test the short circuit output, see if the constant current indicator LED1 is on?

If it is not lit, there is a problem with the constant current circuit. Check whether the components are installed incorrectly, and see if the LED1 is installed.

If it is on, it is short-circuited. Adjust A-RP to the maximum short-circuit current. If the maximum current is not 5A, adjust VR1 to make the current 5A.

Regarding VR5 of temperature controlled fan, when the heat sink is hot to a certain extent, you think the cooling fan needs to work, adjust VR5 to make the fan work.

At this point, your power supply can be put into use.

I wish you all a successful DIY!

全插件主板，尺寸10*10CM

套件的全部：

焊接参考图：