DIY Moving Coil Phono Stage

[Qwin]

Finished my DIY battery powered Phono stage to go with my modified Technics Turntable.

http://www.jkwynn.co.uk/Project_Images/HTMCPS/AD797_008.jpg

Its based around "HypnoToads" AD797 project over on AK. To save posting the whole thing here, this link will take you to my build which is post #327 of the thread.

http://www.audiokarma.org/forums/showthread.php?t=501186&page=22

[struth]

Looks real well made Ken...well done.:)

[Firebottle]

Fabulous build ken.
Good move with the vents and possible gassing of the SLAs.

Just for others, you should NEVER charge a sealed lead acid battery in an air tight enclosure.
Although it is often thought the vents are for release of gas under fault conditions, a small amount of Hydrogen is released on every charge.

A test was being performed in a parking lot at a sister company to the one I worked at.
Venting of the case was ....shall we say 'omitted'. (The designers forgot :scratch:) The small amount of Hydrogen released was enough to form an explosive mixture. Yes you've seen it coming...........

There was an internal spark from a relay contact or something and the unit blew half way across the parking lot :eek:

Fortunately nobody was close at the time.

:cool:Alan

[YNWaN]

Really nice build - top quality :).

Also had a look through your other projects which I really enjoyed too.

[Reffc]

Superb job Ken.

[Qwin]

Alan - Didn't realize gassing was such a problem.
Manufacturers talk about gas re absorbtion and the like.

Good job I put them in (vents), thanks for the heads up.