diyAudio - Entries for April 16, 2013
Go Back   Home > Forums > Blogs

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Rating: 2 votes, 5.00 average.

Rebuilding a Hafler DH200 Part 2

Posted 16th April 2013 at 10:57 PM by Stormrider

Where was I? Right, back to the workshop and cue the music.

Sorry in advance for my photos. They get the job done, but some of them look pretty bad now. I'd retake them but the amp has long since been returned to it's owner.

Once both channels were running happily with their new parts on the benchtop power supply I turned my limited attention to the chassis. The phenolic insulators sandwiching the RCA jacks in place were starting to crumble so, some shiny new jacks were fitted courtesy of for 99 cents. The input wiring was done with 22AWG shielded wire.

Click the image to open in full size.

The pro Hafler models like the P125 and the P230 have a solid aluminum bracket for the ground connections between the main power supply caps. The DH200 and DH220 models only got some tinned wire which isn't very convenient or nice looking. I fashioned up a new bracket with some scrap...
Stormrider's Avatar
diyAudio Member
Posted in Uncategorized
Views 2164 Comments 2 Stormrider is offline

Secure source for A123 Systems LiFePo4 cells

Posted 16th April 2013 at 05:53 PM by dvb projekt
Updated 25th May 2013 at 06:15 AM by dvb projekt (2nd source added)

All members who want to use LiFePo4 cells from the leading company A123 Systems
and want a secure source to get no fakes,
could order them at Lipopower Ltd. in Germany.

The original cells are from the German A123 Systems distributors Reva or BMZ.

You could order them with or without solder taps.

Click the image to open in full size. Click the image to open in full size.

Also a Ri selection is possible.

International shipping and paypal payment is no problem!

P.S.: If you have any questions, send an e-mail to Mr. Karl-Heinz Hofmann with regards from me!


Ive got an email from A123 Systems with a 2nd source

Dear Oliver,

dvb projekt's Avatar
diyAudio Member
Views 1223 Comments 0 dvb projekt is offline

Discrete transistor line amplifier stage

Posted 16th April 2013 at 02:18 AM by rjm
Updated 16th April 2013 at 01:23 PM by rjm

Over the last couple of years most of my interest in audio has been with transistors. I've been slowly teaching myself to read and understand the circuits.

Circuits like this one for example. Not hard, but still a bit too complicated for me to understand without the helpful wikipedia markup attached.

Instead I've looked at primarily at the schematics I have for discrete audio preamplfiers, 1970's vintage typically. Based on what I've learnt so far, I've done up a "test mule" in LTSPICE, shown below.

It's not a circuit you should build. It's for pedagogical purposes, though it does actually work reasonably well - in simulation anyway. Its just a simple starting point to observe how the different parts interact under simulation.
Attached Thumbnails
Click image for larger version

Name:	RJM discrete.png
Views:	436
Size:	93.4 KB
ID:	959  
Attached Files
File Type: asc RJM discrete.asc (3.2 KB, 113 views)
rjm's Avatar
diyAudio Member
Posted in The Lab
Views 764 Comments 0 rjm is offline
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 12:19 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2