Discussion: Requirements: To use the ABS Module, the amplifier must have the following: 1. At least one 6.3V….15V AC winding that has either one side grounded or is floating (not connected to ground at all – can be tested using a multimeter). If one side of the AC filament winding is grounded then thisRead More
ABS Supply Principle
ABS Supply Principle ● The reference voltage is developed across an exchangeable resistor which can also be an external adjustable resistor ● The control loop adjusts the bias such that current through the sampling resistor (10R) produces the same voltage as the reference voltage, but it does so extremely slowly, to reject the dynamic variationsRead More
When is Ultimate Ever EZ?
Now. Check this out: at the front we have the controls and the power supply. All the digital bits flow across those ribbons to selector (left), volume (right) and the audio signal board (chassis back). The audio signal board uses end-to-end analogue potentiometers to adjust volume and vacuum silver relays to select source. TheRead More
Universal Volume Control Application and Instructions
Universal Volume Control Application and Instructions for DIY and assembled units 8/13/2009 Contents: Introduction and Overview The Audio Matrix PCB The Control Matrix PCB 1 – Mounting & connecting the Control Matrix 1.1 Mounting the Control Matrix 1.2 – Power Supply Wiring 1.3 – Connecting the Ribbon Cables 2 – Audio Matrix Input connections 3 –Read More
Introduction and Overview
–The Audio Matrix PCB –The Control Matrix PCB The diyhifisupply® Ultimate Volume Control (UVC) has been designed to offer a State of the Art volume control and input switching selection. It is intended to be applied to integrated amplifiers and preamplifiers, to be used with any compatible following active stage. The Ultimate Volume Control isRead More
Appendix 1
The RC-5 Remote Control Protocol The DIYHFS‟s UVC uses industrial standard Philips RC-5 code The RC-5 protocol was developed by Philips in the late 1980s as a semi-proprietary consumer IR (infrared) remote control communication protocol for consumer electronics. However, it was also adopted by most European manufacturers, as well as many US manufacturersRead More
Appendix 2
–Features, Technical Data and Application Examples –Specifications –Application Examples Features, Technical Data and Application Examples Features: 127 step volume control from -52dB to 0dB attenuation with 12 LED level indicators 5 Inputs with LED indicators Remote control via universal remote control (RC5 code) Options for shunt operation (-52dB to -6dB) 5 way Silver alloy relayRead More
4 – Using Universal Remote Controls to operate the Ultimate Volume Control
Control The UVC can be remote controlled from any remote control that implements the RC-5 remote control protocol (see Appendix 1) and supports audio components (Amplifier/Preamplifier). Examples of relatively inexpensive remote controls that are known to work are the Altronics stock number A1009 “Universal 6 in 1 Remote Control” and the Altronics stock number A0977 “6 InRead More
Appendix 3
The UVC based 2 Channel buffered passive Linestage The picture below illustrates the complete installation of all components of the UVC system in a compact chassis, thus creating a complete passive buffered preamplifier with remote control (requires optional universal remote control). This project is in many ways comparable to “Aunt Corey’s Homemade Buffered Passive Preamplifier”Read More
Chilling at the BeeHive: A Group Test of Nine Different 300B Valves
To Be or Not Be – Those are the 300 Questions Here …Hence, just because a valve has received here a score overall of 90 out of 100 it is not just the only one worth buying, it may not necessarily match your taste and system as well as another person’s system and taste.Read More