- Use original A1943/C5200And 2SA1930/2SC5171.
- The resistance adopts five-ring metal resistance, and the main circuit adopts five-ring metal film resistance with an accuracy of ± 1%, which ensures the good signal-to-noise ratio of the whole machine.
- PCB adopts 1.6mm thick double-sided plate, 2.0 oz copper thick, solder coating full process to ensure good passing performance of large and small current. PCB quality.
- This board features the current advanced C1237 BTL speaker protection circuit, which effectively eliminates the shock sound and DC output protection functions of on and off, making your speaker safer.
- The inter-stage coupling capacitor adopts capacitor 1UF
Description:
The wiring layout of the whole circuit board is quite rigorous and reasonable, and the overall PCB wiring adopts a one-point grounding method. This amplifier board works stably and reliably with high output power; The sound is beautiful and round, and the sound field is open. Strong stereoscopic impression, stable and strong low frequency, excellent signal-to-noise ratio and wide dynamic range; Clear details, excellent transient response, and easy to play all kinds of music, it performs well in the family playing environment.
Basic parameters:
1. Power supply: DC -(35V-55V) recommended-45V and AC12V
2. Power:300W (total harmonic distortion N<0.1%),DC -45V,4 ohm
3. Class A 90W, measured under 4 ohm load
4. Speaker impedance: 4-8 ohm.
5. PCB size: 59 * 236MM.
6. First adjust the differential input current to 2MA: adjust VR1(500R) adjustable resistance makes the two-point voltage of C and D1.5-2V(That is, the voltage at both ends of R9(1K) resistor); At this time, the input differential current is 1.5-2MA, and this value is sound quality.
7. The static current of the large tube is 100MA: adjust the adjustable resistor VR2(1K) to makeAAndBThe two-point voltage is 22MV, at which time the static current I = 22MV/0.22R resistance is 100MA; If the customer cooling fin is large enough, the static current can be increased, generally 100MA-300MA sound effect.
Package include：
1 Pair of E405 Amplifier Board
- Date First Available : September 19, 2019
- Manufacturer : Jolooyo
- Country of Origin : China
