Special Note:
This version is a finished board for welding and debugging. It is recommended to input voltage double 15VAC 30VA power.
Description:
The HV-4 of the HV-X series is based on the AMP circuit of the Lehman headphone amplifier and was developed for the purpose of creating fine products.
HV-4 features:
1. Optimize the regulated power supply. The original machine uses LM3X7 full-field regulated power supply, and its ripple is 3-5MV. This version enables the lower ripple DC stabilized circuit to supply power throughout the field. The ripple is 390UV, which is lower than the original machine. 10 times; (1MV=1000UV)
2. Parallel cross-emitter follow circuit, improve driving force and control force, wide sound field and higher resolution;
3. 300MV earphone special protection circuit, most of the current amps use UPC1237 chip power amplifier with protection circuit to act as a headphone protection circuit, 1.2V protection, boxes and headphones? You know
4. Omron power relay, has a larger contact and copper than a small signal relay, the signal loss is lower.
5. Using a single op amp
6. Optimized ground processing, higher signal to noise ratio
HV-4 hearing Summary: Three-stage balance
Introduction to HV-4 materials:
High quality double-sided PCB with FR1.6MM sheet, 1OZ copper, pad spray tin
Taiwan's 1% precision five-color ring resistor
Main filter electrolytic capacitor: Panasonic FK low internal resistance series 3300UX2PCS,
Electrolytic capacitor for decoupling: warm sound system low resistance - Panasonic FC
Italy AV electrodeless capacitor, sound bottom clean and no sound
TI-JET type single op amp TL081, ST DB139-140 power output tube
F BC550C-560C
ERO 1U5 MKT coupling capacitor
High quality Humming YS215A headphone jack (to cross the silver)
Package:
1pc HV-4 Headphone Amplifier AMP Finished Board