As indicated in the chart (from 20W to 80W RMS). This article refers to the address: http:// Some explanations: - The first thing you have to do is test the amplification factor hfe or β of the last power tube. If their difference is greater than 30%, the amplifier will not give you a clear sound. I am using MJ3001 and MJ2501 transistors, their The difference is 5%. - Before turning on the power, you must short-circuit the input, string an ammeter at the output of the amplifier, then turn on the power, adjust R13 to make the ammeter current to microampere level, if you are lucky enough, you can reach 0, the ammeter current is 10 Microamperes are easy to do. Power amplifier circuit diagram: Power circuit: Component and attribute table: 20 / 35 W 25 / 40 W 35 / 60 W 50 / 80 W 80 / 125 W T1 BC546 T2 BC556 T3 (PNP Darlington) BD898, BD678 BD896, BD676 BDX34 MJ900G 2N6052, MJ2501 T4 (NPN Darlington) BD897, BD677 BD895, BD675 BDX33 MJ1000G 2N6059, MJ3001 C1 10 to 12 pF C2 4.7 to 5.6 nF C3 (no polarity capacitor) 1 to 10 uF C4, C5 2200 uF / 35 V 4700 uF / 35 V 4700 uF / 35 V 4700 uF / 50 V 4700 uF / 50 V R1, R2, R9, R12 10 kΩ R3, R4, R5, R6, R14, R15 3.3 kΩ R7, R8 680 Ω R10 100 kΩ R11 47 kΩ R13 (fine tuning resistor) 10 kΩ F1 (fast) 1,2 A 1,6 A 2 A 2,2 A 4 A BR1 B40C1500 B40C2000 B40C2800 B40C3200 B40C5000 Cooler 4,5 2,7 2,0 1,7 1,5 Transformer secondary voltage (± 20 %) 20 + 20 V 20 + 20 V 20 + 20 V 22 + 22 V 22 + 22 V Transformer secondary current 0,8 A 1,2 A 1,3 A 1,5 A 2,5 A Power (RMS) 20 W 25 W 35 W 50 W 80 W Music power 35 W 40 W 60 W 80 W 125 W Minimum speaker impedance 8 Ω 8 Ω 8 Ω 8 Ω 4 Ω Supply voltage (± 20 %) ± 25 V ± 25 V ± 25 V ± 30 V ± 30 V Maximum current 0,54 A 0,85 A 1,0 A 1,15 A 2,0 A Input voltage required for maximum power 1,8 V 1,5 V 1,7 V 1,95 V 1,7 V input resistance 10 kΩ Bandwidth (-3 dB) 0 – 100.000 Hz THD at 1â„2 P 0,04 % THD at Psin Max 0,18 % Frequency response 93 dB
Bluetooth speaker is a kind of speaker unit which is used for multimedia devices. They have loud sound, wide frequency response range and rich bass.
Our main Multimedia Speakers are full ranges speakers units:
1) From the diameter: we have speakers in 1" ~ 3".
2) From the power output, we have speakers of 2W ~ 15W.
FAQ
Q1. What is the MOQ? Bluetooth Speaker Portable Bluetooth Speaker,Mini Bluetooth Speaker,Waterproof Bluetooth Speaker,Lamp Bluetooth Speaker Shenzhen Xuanda Electronics Co., Ltd. , https://www.xdecspeaker.com
XDEC: 2000pcs for one model.
Q2. What is the delivery lead time?
XDEC: 20 days for normal orders, 15 days for urgent orders.
Q3. What are the payment methods?
XDEC: T/T, PayPal, Western Union, Money Gram.
Q4. Can you offer samples for testing?
XDEC: Yes, we offer free samples.
Q5. How soon can you send samples?
XDEC: We can send samples in 3-5 days.