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HIFI CDM12 clock PCB empty board
HIFI CDM12 clock PCB empty board CD clock DIY empty board, excluding electronic parts
HIFI CDM12 clock PCB empty board CD clock DIY empty board, excluding electronic parts
HIFI CDM12 clock PCB empty board CD clock DIY empty board, excluding electronic parts
HIFI CDM12 clock PCB empty board CD clock DIY empty board, excluding electronic parts

HIFI CDM12 clock PCB empty board CD clock DIY empty board, excluding electronic parts

Regular price $17.92 Sale price $28.96 Unit price per
Tax included. Shipping calculated at checkout.

Product Description :
CDM12 clock board can also be used to improve the clock of other CD players, the effect is obvious!

In order to satisfy some fans who like to do it themselves. The component specifications have been printed on the board surface, no additional drawings, thank you!

IC uses a single op amp, this shop uses the ultra-low noise AD797, you want to save money can use 5534 can also work properly. Three electrolytic capacitors can be used for CD1 with 47-220uf, CD2 with 22~68uf, and CD3 with 10~47uf. Q1 uses the commonly used low power NPN transistor, the shop uses 2N2222A. T1 uses L7812. There are also 2 small patches 0805 on the back, which are 1 ohm resistors in parallel. If they are not found, they can be connected directly.

The crystal oscillator can freely choose the temperature compensation or the ordinary active crystal oscillator. I suggest that if you do not buy the best temperature compensation, (40 yuan to 90 yuan), use ordinary active. Pingyi Wenbu did not have much improvement in the workmanship, just selling a hoe. As the coaxial output board of our store said, why not use an audio transformer? Because cheap transformers can damage the sound quality, many veterans know. Not to save the transformer money, if you go with dozens of audio transformers of a hundred dollars, then you lose the price.

The power supply can be selected from 15 to 24V. The recommended value is 18V.

Note: After installing all components, do not install crystal oscillator, adjust the adjustable resistor to make the output reach the voltage requirement of your crystal oscillator, generally 3.3V or 5V. After the voltage is normal, reinstall the crystal oscillator, and then try to measure the voltage. It will be 0.xV lower and adjust it back. If you replace a different op amp, just in case, please be sure to disconnect the crystal power supply (remove the inductor and disconnect it) and re-adjust the voltage.

The parts on the picture are only for display, The actual shipment is an empty board. You need to purchase additional parts yourself to install. All you buy is an empty printed circuit board, you must pay attention!

Attention

 

As different computer display the colors differently,and the color maybe is little difference from the actual items,but we can guarantee the style is same,but maybe some not same performance on different bodies as on the models.Hope you can understand it.thank you

 

SHIPPING

Shipping Timeframe:

US, Australia, New Zealand: 2~3 weeks  France: 2~4 Weeks

UK, Germany, Canada: 3~5 weeks  Other European Countries: 3~5 Weeks

Asian Countries: 3~5 Weeks       Others: 3~8 Weeks·

 Items will be shipped in within 4 days after payment is received. 

Items are shipped from China using Post Air Mail Registered (HongKong Post, Sweden Post or Singapore Post).

The Parcel Status Can Be Tracked Via Post Official Website or WWW.17track.net 8-10 Days Later After Sending.The Real Delivery Date Is Subject to the Custom & Local Logistic Status.

In Case Express Service Required, Please Contact Us About the Detailed Freight.

If You Don't Receive the Item On Time, Please Take Time to Contact us.

TERMS OF SALE

We're not responsible for any custom duty or import tax.

 If you are not satisfied with the item you received, Please contact us for parcel return & payment refund.The returned parcel shouldbe sentback in original package (or well protected)in14days after the receipt.

If item is founddefective in 1 months, We will send you a replacement free of chargeor arrange the refund after the receipt of the defective item. But you have to pay for the returned freight.

We strive for 100% customer satisfaction on every sale we complete. If, for any reason you are not satisfied with your purchase, please contact us before leaving neutral or negative feedbacks.We'll work with you to solve the problem. We'll automatically leave positive feedbacks after received positive feedbacks from you.

ABOUT US

We are family owned business, and we have served thousands of customers from all over the world. Our products are direct from factory, so we can provide quality items at very competitive price.

CONTACT US

If you have any question, please contact us by the contact seller now button, leave us message or send us emails. Most emails are responded within 24 business hours. We work 5 days a week (Note: Buyers who use free email like AOL, Yahoo, the reply email may fall into your junk mail box. Please send email directly or try send email by other account).


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