Leonora JacobsonZhiluo-HVRaoul Williamson IV-1 HeaTiffany Schmittdphone ACoty Beahan MDmplifier FDr. Nakia BraunMaryam CasperinishedCaleb Romaguera Board (A1 BlueElva AufderharTevin Cartwrightprint)-Mrs. Marie Kub PhDRequired for GetKathleen RobertsGlen Yundtting StNova Schimmel Sr.arted

This is the finished Board with welding and debugging and the 27-type potentiometer containing ALPS.

Please enter the group to download relevant information such as circuit diagram and chassis opening.

The HV-X of the HV-1 series is based on the circuit of the AMP part of the white tooth A1 headphone amplifier. After more than two years of improvement, it has summarized the experience of the burning friends in the actual installation and grinding machine and then developed.

HV-1 highlights:

1, Uniform flow and tube, improve the driving force and control force, and the sound field is wider; Effectively solve the problems of weak intermediate frequency and poor control force of the original A1 circuit to promote AKG and SENHAI series headphones, and the effect is very obvious!

2, 300MV headset special protection circuit, all kinds of A1 currently use UPC1237 chip amplifier protection circuit to act as earphone protection circuit, 1.2V protection, box and earphone? You know!

3, The Omron power relay has larger contacts and copper pieces than the small signal relay, and the signal loss is lower.

4, Separate voltage-stabilized power supply for operational amplifier in AMP to improve separation

5, Optimized processing with higher signal-to-noise ratio

HV-1 listening summary

three-stage balance, neutral and mellow, suitable for various types of headphones, "Wild King" headphone amplifier

HV-1 material introduction

high quality double-sided PCB, using FR1.6MM plate, 1oz copper, solder pad spray tin

taiwan production 1% precision five-color ring resistance

main filter electrolytic capacitor: Updated to F3 series 3300UF 4 PCS,

electrolytic Capacitor for reconnection: warm sound system low resistance-Panasonic NXL audio master

italy AV electrodeless capacitor, sound bottom clean without sound dyeing

A1 Royal ST 33078N dual operational amplifier, ST DB139-140 power output tube

constant current bias circuit F BC550C-560C

RIFA 840 4 U7 ultra-large volume coupling MKP capacitor, flash kill ELNA nijikang, WIMA MKS series coupling capacitor.

High quality Yongsheng YS215A earphone socket (ferry Silver)