2018 new circuit optimization and heavy material selection of components, is really probably the most worth making 1969 amplifier! PCB for the double-sided gold plate
General HD1969, sound quality is recognized by everyone, the only drawback is only 10-13W, driving a large speaker a bit difficult, this version uses Toshiba' 15A 2SC5200 drive, the circuit is optimized, the output power and current greatly improved, the output power can be increased to 25W
1 using 6-pipe program, including two electronic buffer filter, you can avoid switching on and off when the rumble impact sound, the speaker is a good protection, 4-tube board, the boot is absolutely flutter a long-term use of damaged speakers.
2 using 4-way HD1969, under normal circumstances, each channel with a minimum of 30000UF capacitor can barely guarantee no noise, because the AC ripple is very large, 6-tube version, as long as the filter with 4700UF capacitor can be (Such as electronic filter Darlington method, the magnification of 1000, the base connected to the 220U capacitor, the filtering effect is equivalent to the 220,000 micro-filter (220X1000) filtering effect, therefore, to achieve very quiet, detail, level, 6 tube effect and cost are better than 4 tubes.
3 original with very good. Toshiba' 5200 audio tube, Nikon' 18000U capacitor high-current bridge reactor Germany MKP10 series of high-loss capacitors, Siemens output capacitor, Japan's Panasonic' Gold FC electrolytic, Taiwan bent copper pin 1% precision resistors
4. The advantage of using dual capacitors in parallel is to reduce the high frequency internal resistance, let the high frequency to be more delicate and transparent
5. Each board also has a new power supply MKP10-104 capacitors, to further reduce the power supply resistance, the level of detail more clearly
PCB size: 127MMX48MM
1. The core output element is 2 Siemens' new black audio output capacitor
2. Large capacitor for the original board disassemble Japanese N'ikon capacitor 18000UF 35V,
3. Coupling capacitance WIMA' MKP10 series of the most outstanding capacitors, because the MKP10 series is very expensive, which also use the original price for the motherboard disassemble, a lot of permeability than the MKS4 series. Other are new components,
Use and test:! ! This is a bright spot. General board test to string ammeter adjustment, so because of large current, high loss between lines, the test current error, we have improved this shortcoming, you can refer to the following debugging methods.
1. TEST-B first measure the voltage on the ground, if measured 30V
2. Adjustment 204 Adjustable TEST-A point voltage is half of TEST-B, which is 15V
Measurement 102 can be transferred between the two voltage of 10.1-0.2V, static at this time 1-2A, TEST-B after the test point 2 short circuit to complete the test.
Transformer suggested using 4 lines, such as AC-0 AC-0,1 side 2 lines, it is not recommended to use the AC-0-AC transformer,
Transformer voltage range: AC12V to AC28V
- Unit Type: lot (2 pieces/lot)
- Package Weight: 0.2kg (0.44lb.)
- Package Size: 15cm x 15cm x 10cm (5.91in x 5.91in x 3.94in)