Adjustable 0-30V 0-5A Learning Experiment Power Board Constant Voltage And Current Power Board DIY Kit Power Supply Accessories

Adjustable 0-30V 0-5A Learning Experiment Power Board Constant Voltage And Current Power Board DIY Kit Power Supply Accessories

Adjustable power supply motherboard DIY kit for accessories with spare transformers in hand

The old power supply can be modified to use its chassis, transformers, meters and other accessories

Linear adjustable design idea, imperfect output protection circuit, only for amateur study

An English circuit schematic diagram and bill of materials are included with the package

Great for personal DIY




Product information:

1. Please install 1A fuse for AC 220V incoming line




2. Please also weld carefully, the polarity of components must not be reversed, especially for large electrolysis!

For the first time, try to stay away from the motherboard as far as possible! Prevent the electric cannon incident caused by various welding errors! ! !

The voltage and current potentiometers must be welded and contacted 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 arbitrarily! ! !




3. The kit does not include the following:

(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 double 15V current 1A winding on a transformer,

The most suitable one is to disassemble the machine with a broken power supply.

Or dual 12V to dual 15V with a current of 5A for the disassembly of the power amplifier. Add a 15W small transformer.

(2) Voltage and current meter head

(3) 2 heat sinks for TIP3055,

(4) 12V0.2A cooling fan

(5) Chassis and red and black binding posts




Simple circuit description:

L1 is the auxiliary control power supply. It uses a center-tapped dual 12V to dual 15 voltage and current 1A transformers. The L1 winding is preferably wound on a transformer with the main power supply. The transformer at hand does not have such a winding, and a small independent transformer can also be used, but it needs to be controlled by the same switch as the L2 main transformer. L2 is the main voltage output, which requires more power. If 150W--180W outputs 30V, the suitable tap voltage is 0V-15V-23V-31V. The current is 5A (note that the voltage after rectification should be within 50V! The best is within 40V) The main voltage transformer can also choose a 150W commonly used center tap. Double 13V, double 14, double 15, the current is 5A. The 3 wires of such a 5A double output are connected to the first 3 wiring sockets in turn, and the fourth wiring socket is empty. At this time, the relay RL2 is not installed, and the normally closed 2 pins of RL2 are also short-circuited. The auxiliary control supporting electrolysis uses 25V2200*2 or 3300*2, the 7.5K in the main voltage bleeder resistance circuit diagram is replaced by 2K 3W*2, and the main voltage filtering uses 50V2200UF*3 (the total capacity should not be greater than 6600uF) to adjust the voltage and current of the two external The potentiometer can be replaced by a stable and reliable multi-turn adjustable!

Change explanation: When the load is open circuit or light load, the voltage will have 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 prevent the control circuit (auxiliary circuit) from losing power and causing the output voltage of the main circuit to run out of control)




Responsibility statement:

Since this product is provided in a kit, the kit needs to be assembled by yourself, including electronic component soldering, circuit debugging, etc., which are complex actions that require experience.

This kit provides all components and circuit schematic diagrams, but users need to prepare transformers, casings, and voltage and ammeters by themselves! The user must understand that there may be failures due to unsuccessful assembly due to various unexpected reasons, and the user will be responsible for the losses.

Electronic products are closely related to electricity, please confirm whether to purchase or not according to your own electronic production capabilities.

This kit does not provide any technical support. Before purchasing, please refer to the schematic diagram of the kit and related debugging instructions carefully to confirm that you can complete the independent debugging before purchasing. Thank you for your cooperation!




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

The principle of constant voltage and constant current:

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

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

If R