HV-1 Headphone AmplifierBoard Kits Base On Beyerdynamic A1
NOTE: This is a DIY Kit, All parts need you weld and test. (With ALPS Type 27 50KA potentiometer)
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.
Panasonic FK Series main smoothing capacitor
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.
Package:
1set HV-1 Headphone AmplifierBoard Kits Base On Beyerdynamic A1
1set HV-1 Headphone AmplifierBoard Kits Base On Beyerdynamic A1
Shippment:
1.We provide free shipping to international via China Post Airmail . We can also ship byTNT/EMS/DHL/FedEx for alternative shipping method for corresponding fees. Please let us know before payment if you need split shipment.
2.International shipping requires complicated shipping procedures, If you have not received your shipment within 30 days from payment, please contact us.
Returns & Replacements & Repair:
We accept returns & replacements within 30 days from the day the customer receive the products, please make first contact within 30 days from receiving the order. Products should be returned in original condition. As a benefit to our customers, we also provide repair within 3 Months from the day when this item is shipped out, after repair is done, we will send you the item, but the customer should pay both shipping ways.
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