kitchen table sets No Feedback Power Amplifier Board Kit bathroom storage cabinet Home Furniture

kitchen table sets No Feedback Power Amplifier Board Kit bathroom storage cabinet Home Furniture

Name: kitchen table sets No Feedback Power Amplifier Board Kit bathroom storage cabinet
Brand: MMO Dropship
SKU: 3256803487804058
Price: 148.54 VND
Availability: InStock
Rating: 4.9 (98 reviews)

Code: TD-3256803487804058

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$ 148.54

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Other people want this. 18 people have this in their carts right now.

Description
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Origin:	Mainland China
model:	108
Rated voltage:	DC

This circuit kit is a spare part and needs to be welded and debugged by yourself. 2 pairs of high-power tubes need to be purchased separately

Please choose the kit, the finished board or the complete machine according to your personal ability level.

1 set contains 2 boards, mirror design, full price with mid-power tube, key parts are matched, PCB is double-sided 2.0 thick 70UM double copper gold-plated board, you can choose to weld the finished board

The detailed material list can be seen at the bottom of the sales sticker. They are all made of very good materials. The main body of the resistor is an expensive British FR4 non-inductive resistor. If you switch to a DALE resistor or a 718 resistor, the price will be much lower, but the effect will be reduced. buckle.

For the convenience of production, we have added a speaker protection circuit on the board, so that the safety is guaranteed

PCB size 116X90.5mm
Power: 150WX2

In the circuit design, the original designer highly respects the minimalist circuit. Their design concept is mainly to have no large loop negative feedback and attach great importance to reducing TIM (Transient Intermodulation Distortion). The designer believes that, compared with the total harmonic distortion (Total Harmonic Distortion) emphasized by the general manufacturers, in fact, the transient intermodulation distortion (TIM distortion) has a much greater impact on the subjective and actual hearing perception! After research, it is found that the transient intermodulation distortion is closely related to the applied negative feedback. If a large loop negative feedback design is used in the amplifier, better THD test data can be obtained, but such sound is not good to hear. The so-called "stone machine sound" and "transistor sound" are precisely this reason. Therefore, in this Swiss post amplifier, the whole machine has no large loop negative feedback design, and only a small amount of negative feedback design is used locally. The input circuit will not be affected by the back electromotive force of the speaker, making it good The characteristic of transient response, the frequency band is extremely wide, reaching 1Hz-1MHz (+0/-6dB), such a wide frequency response greatly reduces the influence of high-frequency phase lag drift, and further overcomes TIM distortion. In actual listening Almost no "transistor sound" is felt.

In fact, the factory has already published the block diagram of this amplifying circuit on its website, but has not announced the specific parameters, because it is said that this circuit has been patented. We did a simulation test before the circuit design, and the distortion was extremely low.

The following is our own simulation test, the high-order harmonic distortion is very low

input voltage DC+_35VreachDC+_55V

Debugging only needs to adjust the only on the board -An adjustable resistor，Adjust the output midpoint。

Because it's allDCAnd non negative feedback architecture，The midpoint drift will be slightly larger than the general power amplifier，+——100MVThe appearance of is normal，The original machine is the same，Good heat dissipation will make the midpoint more stable

kitchen table sets No Feedback Power Amplifier Board Kit bathroom storage cabinet

DELIVERY ESTIMATE

We processes orders between Monday and Friday. Orders will be processed within 5 business days of ordering and shipped the next day after the processing day. Please note that we don't ship on weekends.

We deliver your orders in 15-20 working days (free shipping), International orders delivery is subjected to the policy of third party courier service, and differs from country to country basis.

Due to the Covid-19 pandemic, you may experience delivery delays but we are committed to getting your order to you as soon as possible.

Note: Please ensure all delivery information is correct. If there is incorrect and/or missing information, we may be required to contact you to update the delivery information, which may cause delays in delivering your order. Delays may also occur as a result of customs clearance.

RETURN POLICY

At MMO-Dropship we strive to make our customers 100% satisfied with the product they’ve purchased from us. If you are experiencing any shipping or products issues, and you’re feeling frustrated, then please send us an email and our team will assist you right away.

We have a 7-day return policy, which means you have 7 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can contact us at [email protected]. If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

You can always contact us for any return question at [email protected].

DAMAGED ITEM AND LOW QUALITY

For the fastest resolution, please include a photograph demonstrating the poor quality or the damaged area of the item. The most optimal pictures are on a flat surface, with the tag and error clearly displayed.

We will use this information to help you with your order, and eliminate errors in future.

REFUND POLICY

If you feel the product that you’ve purchased does not show the requirements that you initially had in mind, then you do have the option to request a refund.

Here are the circumstances in which refunds will be granted:

You can get a refund if:

You aren't happy with your order: You’ve purchased your MMO-Dropship products in the last 7 days and want to return them, we will process full refund as soon as possible when we receive the items from you

The product you’ve purchased is completely non-functional
You did not receive your product within 60 business days or 90 business days (South America) of purchase

Please note that refunds can take 3-5 business days to return in your account.

You can always contact us for any return question at [email protected].