Please note before you buy: Products as shown in my main picture, one channel price. so if you need stereo channels, please buy 2pcs. it needs to solder by yourself .thank you!
Features:
Model:JLH1969
Name: Amplifier Board
1. Double-sided , thick copper PCB.
This one is doubled-sided so the copper pad durability is
greatly enhanced by plated-through hole ( PTH) process.
2. Hermetically sealed metal casing transistors used on both small signal and power stage.
3. High quality electrolytic capacitors.
4. High quality solder with silver content is used in soldering.
5. ERO film capacitors for audio coupling.
6. Thick and heavy aluminum plates already mounted on the board
( as in the pictures) for easy to interface with heatsink.
Specification:
1.Operating voltage: DC 12V-35V (corresponding to 9-26V transformer)
2.Output sound power: approx 10-15W
3.It can be pushed 3-8 inches, 120 watts of power bookshelf box,
full-range boxes. Sensitivity to be higher than 83db.
4. Adjustable quiescent current between 0.3-1.8A,
recommended 1.2 Ann (radiators need more than 0.7 kg).
Adjust the midpoint / quiescent current method:
midpoint:
1. Select the universal table’s 10A ;,
2. black pen -GND, red lead -TP1;
3. Adjust the adjustable resistance KT1 (supply voltage 1/2)
Current:
1. Select universal table’s 10A,
2. Loosen the screws of VCC supply, pull out the wires,
3. One pen connected to the pull out wire, the other pen connected to
the screw of terminals, which is a measure of the current
(equivalent to remove the VCC line of 1969 board , replaced with an ammeter),
4. Adjust the adjustable resistor KT2 changing the current
NOTE:the 2N3055 is ST or Motorola is pre-owneded in good condition.1pcs JLH 1969 Class A audio hifi power Amplifier Board High Quality PCB MOT/2N3055 diy kit(not assembled with all component as pic shown with heat sink)
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2. Orders will be processed instantly and dispatched within 1-3 business days except hoilday, so we do NOT accept any email/message note after you place orders.
3. All package need to wait 30 days,Please take care it.Less than 30 days,we can't take a refund.
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If you can't receive the product within 2 months (60 days), please contact with us,we promise to payback 100% of your money.
We ensure our products work normally before post.If the products is broken before arrival to you,all you should do is taking a photo to show us our broken product.We promise to payback 100% of your money. - If the item is defect when you receive it or you are not satisfied with it, please return it within 14 days for a replacement or money back. But the items must be back in factory condition. Please contact us and double check the return address before you return it.
- If is item is defective in 12 months, you can return it to us. We will send you a new replacement after receiving the defective item.