Details：

PCB Size: 178MM x 68MMAMP board works voltage Recommend: AC12V-AC24V ( if your voltage between AC24V-AC33V. then need change the main filter capacitor with 50V version.The default filter capacitor is NOVER 10000uf/35V)Transformer recommend about 200W (2 groups Independent voltage. such as 0-AC22V 0-AC22V)Speaker：4-8 ohmOutput Power: 25W+25WGeneral HD1969, the sound quality is recognized by everyone, the only weak point is only 10-13W, drive a large speaker a bit difficult, This version using the ON MJE15024 25 gold seal transistor, the circuit is optimized, the output power and current greatly improved, you can increase the output power to 25W Class A status.1： with 6 gold seal transistor structure, 2pcs for electronic buffer filter, can avoid the speaker Impact sound when switch machine , this is a good way to protect the speakers.2. with 4 transistor mode HD1969, under normal circumstances, each channel with a minimum of 30000UF capacitor can barely ensure no noise, because the exchange of ripple is very large, 6 tube version, as long as the capacitor with more than 4700UF filter will be ok.(Such as the electronic filter Darlington way, the magnification of 1000, the base connected to the 220U capacitor, the filter effect is equivalent to 220,000 micro (220X1000) of the filtering effect, so the 6 tube effect and cost are much better than 4 tubes.3. the output with the ON MJE15024 / MJE15025 transistor as the output, bass dive deeper, power than the general 1969 large 1 times.

Note：

Diy Kit：as the picture show ，all parts need buyer to solder it ！Assembled Board 1：as the picture show，have tested well ！Assembled Board 2：as the picture show，have tested well ！