Audio DIY

Very Easy DIY Audio Mains Filter

Easy DIY Audio Mains Filter Parts

This is no doubt the easiest method of making a good quality mains filter suitable for any audio visual use be it a HiFi, home studio or TV system. These also make great mains filters for computer based systems. I make and use these on all my computer and audio based systems since they are better than the basic ones you buy for a computer and compare to many dedicated HiFi ones for a fraction of the price. When you price up something like the Megaclamp from Russ Andrews at £180 going the DIY route starts to look very appealing.

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LM3886 Gain Clone Amplifier DIY

Gainclone DIY

In 1999 a manufacturer called 47 labs released a 3000 USD amplifier called a gaincard. Although it got good reviews it caused a great deal of controversy because it was based around a pair of 5 USD LM series power amplifier IC's with a basic power supply. So a 3000 USD product had about 100 USD of parts inside. It is not unusual to find any audio equipment selling for at least 10x the parts cost today. Coming from an electronics background I regularly see equipment I would not pay the retail price for based on the grounds the build cost being so low in comparison.

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Audio HiFi Mains Cable DIY

DIY Audio HiFi Mains Cable

Nothing invokes more of a mixed response in Hi-Fi circles than the concept of 'audio-grade' Hi-Fi mains cables. The idea of spending up to £1000 for a mains cable for many, myself included, seems ludicrous. Audio grade mains cables are very much a Hi-Fi thing and not so much in the pro-audio world were the only time a slightly more expensive mains lead would be used is one that has screening to stop noise radiating out of the cable and inducing on other near-by more sensitive audio carrying cables. This does have some engineering sense behind it.

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Teac VRDS Copland 288 Rubber Tray Repair

Copland 288

The Teac VRDS mechanism used in many high end players does not age well. The gears go soft and start to perish making the unit skip on playback or the tray fails to open and close. These gears are very hard to find now and expensive if you do manage to find some. Therefore unless you have a 3D printer and a good set of gears as a template then I would avoid paying too much for any Teac based cd player.

 

Removing The Tray Rubber

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Nelson Pass Labs B1 Buffer Pre-Amplifier Update DIY

Nelson Pass Labs B1 Buffer

Having sold the last B1 buffer I built I ended up building another. I had a spare pcb sitting around for a while and since it is such a good pre-amp, easy to build and the fact I had 90% of the parts already it was a situation of... might as well. It also meant I could use one of those nice aluminium cases from modshop in Italy to match my copland cd player and the lightspeed pre-amp case. Solid state builds such as this simple design do not have much to go wrong and testing is safe unlike tube gear. A big difference working on 18V here rather than 300V plus.

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Linn Turntable Valhalla Power Supply Repair

Linn Turntable Valhalla Power Supply

I recently helped a friend to repair a Linn Valhalla power supply pcb. It would seem that these are prone to particular failures and a common one is low motor torque in which the motor buzzes or vibrates since it is too weak to drive the platter. This turned out to be R32 (560k) on the board. R33 had also deteriorated with the ceramic body breaking up. I have uploaded the circuit as a png and pdf file which some may find useful.

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Passive Lightspeed Attenuator Pre-Amplifier DIY

Lightspeed Attenuator Pre-Amplifier

I have been working on building a light-speed attenuator pre-amp in a nice case matching to match the chassis used in the Nelson Pass F5 and F3 power amplifier builds. This is a scratch build rather than a kit. I needed to buy the case from Italy and 4 quad matched Silonex NSL-32SR2 from the states. Matched LDR's can be difficult to get hold of and to match these yourself requires buying a large quantity and constructing a matching circuit to test them all across the working range. Quite costly and time consuming.

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Power Amplifier Speaker Output Headphone Adapter DIY

Speaker Output Headphone Adapter

I was wondering if it was possible to drive a pair of regular dynamic headphones from a power amp such as my Class A F5. Sometimes I have periods of time without a pair of speakers such as if I have sold them and looking for something new to replace them with. In the meantime it would be nice to use a pair of headphones which quite frankly are hard to beat with most speakers.

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Grado RA1 Headphone Amplifier Clone DIY

Grado RA1 Headphone Amplifier Clone

Fancy making your own Grado RA1 amplifier clone. Well the circuit below is all you need. About £10 worth of electronic parts minus the case and regulated supply. Also very easy to make on veroboard or protoboard. The original circuit came from diyaudioprojects.com who I understand reverse engineered an original RA1. The design can be easily altered to use other better quality op-amps and more importantly E24 series preferred resistor and cap values.

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Teac VRDS T1 / Copland 288 - CMK-4 Mechanism (Broken Gear Repair)

VRDS Copland 288 - CMK-4 Mechanism

The Teac VDRS CMK-4 mechanism is used in the following CD Players :-

Copland 288
Copland 277
TEAC VRDS-7
TEAC VRDS-T1
WADIA 6
WADIA 8
WADIA 21
WADIA 850 (Version a mech)
Krell KAV-300
 

My Copland CDP

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