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Remote 23-steps volume control (need to add TVC or resistors), optional 6 pairs input selection

Make-before-break 23 steps stereo selector

Make-before-break 23 steps stereo selector

Many have asked us for a remote control for our Django TVC passive preamp. It’s great to adjust the volume from the sofa.

A few years ago we made a remote-controlled step motor for our 23-steps Seiden switch, it worked initially, but there were two major problems. Firstly, the switch stopped at the wrong position at times. Secondly, the step motor was quite noisy. Now our new relay-based remote control overcomes these two problems – and it’s reliable, durable and quiet.

How does it work? When an electric current passes through the coil inside the delay, a switch opens or closes the connection. It’s a mechanical switch like the Seiden switch. Audio signal only passes from one pin of the relay to the other pin. By using high quality audio grade relay, the signal path remains clean.

 

  How much will it cost?

It costs more than other relay-resistors volume control because it uses a lot more delays. Below is my estimation:

  • Volume control, display, and remote control : about $219
  • Volume control, display, remote control and channel control : about $289

 

Operation:

Remote control : 2 buttons for volume control and 2 buttons for channel control

Front panel control : Press the knob to change channel or turn the knob to adjust volume.

 

Installation:

Drill one 15mm hole for a number display and one 5mm hole for IR receiver (optional: one 8mm hole for switch shaft for manual selection)

 

Availability:

The first prototype will be done in early December, 2014.

 

 What do you think? Please share with us your thought.

 

Remote control
Remote control
Make-before-break 23 steps stereo selector
Make-before-break 23 steps stereo selector
Control and display board
Control and display board
Break-before-make 6 stereo channels selector
Break-before-make 6 stereo channels selector
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Universal Volume Control Application and Instructions

article

Universal Volume Control Application and Instructions

for DIY and assembled units 

8/13/2009 


Contents:
The Audio Matrix PCB
The Control Matrix PCB
1.1 Mounting the Control Matrix
1.2 – Power Supply Wiring
1.3 – Connecting the Ribbon Cables
3.11 – Connecting the Direct Output to RCA Output Connectors
3.12 – Connecting the Direct Output to an active Linestage
3.2 – Connecting the Buffered Output
The RC-5 Remote Control Protocol
Features, Technical Data and Application Examples
–Features
Specifications
–Passive operation standard mode
–Passive operation 100k shunt mode (option)
–Passive operation all modes
–Audio module with LSK389 buffers fitted
Application Examples
The UVC based 2 Channel buffered passive Linestage
The UVC/UTS based 2 Channel active Linestage
Backplate Mounting of Power Switch
Optional Side Plate Mounting of power Switch
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Super low noise 10M45S CCS Kit

Super low noise 10M45S CCS Kit

Price: $19.00 for 1 board / kit.

CCS based on IXYS 10M45S, super low noise, 2ma to 100ma/450V. includes parts shown at below+ insulation parts for chassis mount.

 

Instructions:

  1. The indicated trace is cut and resistor placed across it to prevent oscillation. Resistor from1K to5K is acceptable.
  2. Connect B+ as shown, or optionally a 1ohm resistor can be connected from that trace to the trace labelled B+. In that caseB+ connects to the labelled B+
  3. Connect anode as shown to reduce possibility of oscillation. Keep all leads short.
  4. Adjustable pot is 2K and can adjust the CCS from 2 to 100ma. Note 1: higher current requires heat sinking. Recommended to install to chassis with hardware provided and as shown. Note 2: the back of the IXYS is conductive and must be insulated from the chassis.

Caution! Shorting the IXYS CCS will damage the 10S45M. There is no warranty for that.

For reference: the B+ voltage less the anode voltage below the CCS is the voltage available for signal swing. Ie400VB+ – 200Vanode = 200v so +-100v signal.

 

For other shipping options, Check our Website by clicking the icon below:

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Tentlabs Mini E-Choke (100mA)

Tentlabs Mini E-Choke (100mA)

Price: $43.00

Mini E-Choke is very compact for current below 50mA. It is suitable for preamps.

Like the bigger E-Choke, Mini E-Choke replace traditional chokes that generally work quite well, but suffer from serious disadvantages:

• high weight
• relatively big size
• magnetic field radiation that induces hum in the circuit

Mini E-Chokes effectively solve all these issues, and offer up to 60dB supply ripple reduction.

 

Specifications

Electrical
• maximum current 100 mA
• maximum Vdc 800 V
• internal limit: no
• inductance 10 H
• maximum voltage drop @ Imax 9 V
• short circuit protection no
• protected for inverse connection yes
• maximum heat production 0,9 W
• minimum capacity C1 47 uF
• optimal capacity C1 = C2 100 uF

 

Specifications

Mechanical
Module size: 26*15*15 mm (W*L*H)
Hole pitch: 14 mm (symmetrical). All pin diameters 1.0 mm, pin length 9 mm
Mass: 12 gram

 

Manual

Manual can be downloaded in Tentlab website here.

Warrantee

This module is warranted for 5 years by Tentlabs (the Netherlands), assumed all mounting instructions are followed

For other shipping options, Check our Website by clicking the icon below:

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Tentlabs Mini E-Choke (50mA)

Tentlabs Mini E-Choke (50mA)

Price: $37.00

Mini E-Choke is very compact for current below 50mA. It is suitable for preamps.

Like the bigger E-Choke, Mini E-Choke replace traditional chokes that generally work quite well, but suffer from serious disadvantages:

• high weight
• relatively big size
• magnetic field radiation that induces hum in the circuit

Mini E-Chokes effectively solve all these issues, and offer up to 60dB supply ripple reduction.

 

Specifications

Electrical
• maximum current 50 mA
• maximum Vdc 800 V
• internal limit for I larger than 68 mA
• inductance 78 H
• maximum voltage drop @ Imax 12 V
• short circuit protection no
• protected for inverse connection yes
• maximum heat production 0,7 W
• minimum capacity C1 27 uF
• optimal capacity C1 = C2 47 uF

 

Specifications

Mechanical
Module size: 26*15*15 mm (W*L*H)
Hole pitch: 14 mm (symmetrical). All pin diameters 1.0 mm, pin length 9 mm
Mass: 12 gram

 

Manual

Manual can be downloaded in Tentlab website here.

Warrantee

This module is warranted for 5 years by Tentlabs (the Netherlands), assumed all mounting instructions are followed

 

For other shipping options, Check our Website by clicking the icon below:

Store

online store

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Tentlabs E-Choke

Tentlabs E-Choke

Price: $89.00

The E-choke replaces traditional chokes that generally work quite well, but suffer from some disadvantages:
• high weight
• relatively big size
• magnetic field radiation that induces hum in the circuit

The E-choke effectively solves all these issues, and offers up to 70dB supply ripple reduction at currents up to 500 mAdc. In addition, intermodulation distortion reduces dramatically, see the measurements and background articles below.

Pasted Graphic
UL40-S2, triode, distortion no E-choke

Pasted Graphic 1
UL40-S2, triode, distortion with E-choke

Look how effectively the choke removes the hum, but also dramatically reduces the intermodulation products of the signal (1 kHz) with power supply ripple (100 Hz)

 

Specifications

Electrical
• Imax out 500mAdc
• Vmax in 450Vdc (can be adapted to 600Vdc max when changing input capacitor to suitable working voltage)
• Vripple 15Vtt (maximum input ripple)
• C-in 330uF/450V (included on module):
C-in may be reduced linearly when current consumption is lower than 500mA
C-in must be reduced when valve rectification is applied
• C-out 330uF/450V (externally required, recommended value)
• Voltage drop <17Vdc (in-out at 500mAdc load)
• Dissipation <5W
• Heatsink integrated, connected to gnd
• Rejection :
>40dB, time modus off (mostly used with class AB amplifiers)
>60dB, time modus on (recommended for class A amplifiers)
• short circuit NOT protected, always include fuse at module output

Specifications

Mechanical
PCB size: 72*50*50 mm (W*L*H) (includes electrolytic, excludes standoffs)
Hole pitch: 63*41 mm (symmetrical). All hole diameters 3.2 mm

Manual

No manual yet, but Tentlabs is working on it. Connections are fairly straightforward, see example below:
E-choke application
You may want to change the 1N4007 to the better sounding BYV96E

Warrantee

This module is warranted for 5 years by Tenlabs, assumed all mounting instructions are followed

 

For other shipping options, Check our Website by clicking the icon below:

Store

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