100W Mono Transistor Power Amplifier Bare PCB DIY Circuit "UA741 MJE2955/2N3055" "This item is only PCB board "1 channel or mono, on PCB board shows the part number of each component, easy to assembly for people who like to build power amplifier by themselves. This circuit uses IC to be pre-driver and transistor at output stage  power transistor 2N3055 / MJ2955 It requires dual power supply +34V and -34V It comes with the schematic diagram !!! PCB size = 7.5cm x 10.4cm Combine Shipping Discount Policy - We are glad to discount for combine shipping. - Our store uses automatic shipping fee discount calculation. Shipping fee will be base on the highest shipping cost plus 50% shipping fee of each item purchased from our store.   For example, you purchase 3 items which have shipping fee : $6 + $4 + $2 = $12  You pay only $6 + $2 + $1 = $9, Shipping discount = $3 - In case, shipping cost is not in line with this calculation, feel free to contact us before to make the payment. Payment - PayPal only please. - All major credit cards are accepted through our secure payment processor PayPal. - Payment must be made within 5 days upon auction end. Shipment - Usually products will be shipped to your PayPal address. In case, you  prefer to send to other address, please inform us by Ebay message or  PayPal’s note. - All products are shipped by Thailand Post Service  within 48 hours by air mail after payment is clear. Except the weekend,  shipping will be postponed to Monday. - We ship to worldwide by  Economy Air mail ( 3-4 weeks ) as gift for customs declaration. Please  let us know if you prefer expedite shipping, extra shipping cost is  required. - Due to shipping cost is low, tracking number is not included, in case, you prefer the tracking number, you can send additional cost  $2.5 to us via PayPal. - We are not responsible for any custom duty or import tax. Return Policy - We offer 30days money back. You can purchased with more confident. - Full refund if within 45days buyer doesn't receive our product. - After you receive our products, If it is defective or missing part,  please take the photo to be an evidence and contact us within 30 days.  You can return product back for replacement or refund. But shipping  costs and custom tax are not refundable. Feedback and Support - We leave positive feedback after receiving the payment. - Please contact us before to leave negative feedback or open the case. We will do the best to resolve any problems. - We always support our customer after sale. - If you have any problems or any questions with our products, please feel free to contact us. We have engineer to support you. Don't worry if you are new in electronic. - Due to timing difference, we may delay to response but it should be  within 24 hours. Our working hours are from (GMT+7:00) 08:00AM to  20:00PM.