NEW Assembled HV1 Headphone power font b amplifier b font board base on Beyerdynamic A1 HV
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NEW Assembled HV1 Headphone power font b amplifier b font board base on Beyerdynamic A1 HV
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NEW Assembled HV1 Headphone power amplifier board (base on Beyerdynamic A1) HV-1 Headphone amp finished board

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Price:  US $45.18 / piece
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NOTE: This is a finished board, welded debugging OK.

PCB Size: 160mm*110mm

Works Voltage: Dual AC 12 – 16V

Highlights:

1, Power Transistors in parallel to enhance the driving force control, Enhance the driving force control, a broader sound field; effective solution to the original A1 ircuit romote A-K-G, S-ennheiser headphones IF weak, the problem of poor control, to enhance the effect is very obvious.
2, 300MV headphones dedicated protection circuit, A1 Queen ST 33078 N dual op amp, ST DB139 BD140 power output tube.
3, Omron power relay, Than small signal relay have greater contact with copper, lower signal loss.
4, For the op-amp separately regulated power AMP, separating degree of ascension.
5, Optimized ground treatment, the higher SNR.

Basic parameters:

• Effective Vp-p 23.47
Frequency response, 20 HZ-20 KHZ (+ 0.01, 0.09),
signal-to-noise ratio:-90 DB or below,
the dynamic response, more than 91 DB
• total harmonic distortion (THD) : < 0.007%
• intermodulation distortion: < 0.007%
• stereo separating degree: > 88 DB (1 KHZ)
• suitable 32-600ohm load.

Main materials:

Original ST33078N dual op amp, STDB139-140 power transistor.

PHI FK Series main smoothing capacitor

Japan ALPS 27 type Potentiometer.

1/4W 1% precision metal film resistors

AUDIOPHILE MKP 4U7 400V 3% precision capacitance

Omron G2R – 2 12V Relay 700MV Protection circuit,7 seconds delay connect function.

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UPS Expedited 3 - 7 days
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Post Air Mail Free Shipping 15 - 45 days
Return Policy If the product you receive is not as described or low quality, the seller promises that you may return it before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe) and receive a full refund. The return shipping fee will be paid by you. Or, you can choose to keep the product and agree the refund amount directly with the seller.

N.B.: If the seller provides the "Longer Protection" service on this product, you may ask for refund up to 15 days after order completion.
Seller Service On-time DeliveryIf you do not receive your purchase within 60 days, you can ask for a full refund before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe).

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Price:  US $45.18 / piece
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