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Location: FOSHAN
Ships to: US,
Item: 325294912023
Return shipping will be paid by:Buyer
All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money back or replacement (buyer’s choice)
MPN:Does not apply
Compatible Brand:Universal
LJM:LJM
Type:amp board/kit
DIY KIT: all parts will need yourself to soder it. Assembeld board: we will solder and test it well. Blameless design Class-B amplifier This power amplifier board is designed according to the Blameles amplifier class B power amplifier of AMPLIFIER DESIGN of DOUGLAS SELF, UK. And it’s not the most simplified version of the circuit in the book. Instead, a more powerful CFP input stage version of the circuit highlighted in the SELF book is used. This circuit is not included in the standard circuit on the following pages. Rather, the better performance of this circuit than the standard circuit is presented separately. lower distortion. It’s just that most of them are done against the standard circuits given by SELF. So I don’t understand that the standard circuit of SELF is not an optimized circuit. And the components in the book are not the same as the components we actually use. So the working point must be set individually. And it can only be measured using APSYS. Instead of copying the circuit from the book exactly. But the components are not the same. Such results are not good. The effect is not good. And LJM is based on the optimized cfp input stage .The triple-EF output stage structure circuit design in the book. And measured with APSYS TWO according to the components used by LJM. Then adjust the operating point to achieve the actual excellent performance Power tube with ONSEMI NJW0302G 0281G 150W 250V 15A transistor. The medium power driver tube uses KTA1659A KTC4370A due to Toshiba A1930 C5171 discontinued. Decoupling capacitors use Japanese original nichicon PW LOW ESR PW capacitors. The feedback capacitor adopts ULTRA LOW ESR Japanese original NICHICON HN/HZ gold capacitor. Amplifier board parameters. Supply voltage range DC +- 15V to DC + – 55V Output power 100W 8R, 200W 4R. (DC + – 45V) PCB size: 81*81MM THD+N < 0.005% Input sensitivity 1.5V 100W 8R RMS. Frequency response 20HZ-20 KHZ -0.1DB Quiescent current Default 10MA (R1 resistance = 9K1). 50MA (R1 resistance=10K) Package include: Blameless design Class-B amplifier kit or assembled board X 2 channel Payment: We ONLY accept PayPal. Payment must be made within 3 days of the auction end time. Non-Paying bidders will be reported. All items will be shipped within 1-3 business days (from china)upon receipt of payment. We ONLY send item to buyer's registered Paypal address,Buyer must be responsible for their postal address Customs & duties: For cross-border transactions,.we are not responsible for tariffs and duties. However, buyers may be responsible for actual, applicable tariffs, and duties as requested by respective country laws Return & Exchange: >> Some items return is accepted within 7 days after the buyer’s receiving the item.(please see the detail describe)[In case of DOA (Dead on Arrival), please report within 3 days] >> Returned item has to be new, unworn and in its original condition. >> After getting the returned item, we will refund the customer at the item’s price ( excluding the shipping costs to and from )
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