Precise details:
Need to know before buying:
There are kit parts(#2) and finished products(#1) to choose from, which can be used as audio enthusiasts DIY or technical school teachers and students for electronic training purposes. The kit production requires basic welding test skills. Please consider buying it. If you are unsure, please purchase a finished board. The kit uses FR-4 spray tin high-quality A-level PCB, which is convenient for welding and does not need to be debugged. As long as the welding is correct, it is basically successful at the first time. It is suitable for 0CL or 0TL output power amplifier circuit, BTL is only suitable for dual power BTL architecture, single power BTL cannot be used, please pay attention to use independent windings to supply power to the protection circuit, so that you can close the power loop, otherwise the speaker ground signal is mixed together, easy to produce thousands of Disturbance and hum, some friends are easy to produce hum in order to facilitate the use of the front-level power supply and the protection circuit. Please do not question or mislead others by random evaluations, and the advantage of this is that it can improve the reliability of the protection function.
Function:
1. Start-up delay DC protection, anti-shock when power off;
2. Fully sealed sterling silver contacts, Japan Omron relay, long life and reliable;
3. 7812 is used for voltage stabilization, AC and DC automatically identify the power supply range to allow 12-24V, and the current is about 60mA;
4. The pull-in time is about 3 seconds;
5. The use power is up to 200 watts, which can be increased to 400 watts when used in mono parallel
6. The circuit is simple and reliable. It is very easy to make and free of debugging;
7. The whole board area is 25*5*3.1 cm.
Assembly tips:
1 This assembly prompt is suitable for novice welding instructions. Please follow the assembly prompt strictly to improve the success rate. Blind welding may bring components or other damages, please pay attention.
2. The main chip, bridge stack, 7812 voltage regulator tube, electrolytic capacitor, and diode need to pay attention to the polarity. Please check carefully after welding to ensure that it is correct. The direction of the chip is correct.
3. Connect to the AC/DC 12-24V power supply (first do not need to connect the power amplifier and the speaker, the power input does not need to be distinguished between positive and negative), listen carefully, the relay should click in about 3 seconds, and use the 12V output of the 7812 chip to lead to the protection The positive terminal of the board is input, and the relay should be able to quickly open, which means that the delay and protection functions are working normally, and then connect to the power amplifier and horn.
Package includes:
1 x Speaker Protection Board