Dear friends, Amb.org is currently down due to a problem at the ISP. Unfortunately it is taking a long time for them to fix it. I’m very upset that it has taken so long without resolution, and it appears that it will be down for maybe another several days. The level of service I’m receiving...

This is not headphone-related, but if you're also into speaker-fi, and interested in a bi-amp or tri-amp setup, you might want to check this out. I have just finished developing an upgrade analog board for the Behringer DCX2496 and DCX2496LE DSP loudspeaker management systems. For full info...

Since no one has created a new thread for the meet that happened yesterday, I took the liberty to start one here. Anyway, it was another great meet. Thanks to everyone who helped make it happen. Here is a gallery of photos I took at the event: http://www.amb.org/ti/audio/chang20140216/ Enjoy!

I posted the info here and at headwize in the past, but it gets buried in threads and hard to search for, so I wrote a new one with more details and illustrations, and made it a sticky topic at my forum. I hope this is helpful info for any of you troubleshooting a circuit with discrete BJTs...

Someone sent me a direct email asking about how to identify capacitors with class X or Y rating, suitable for use in a ground loop breaker. I accidentally deleted the mail and thus cannot reply directly, so I'll answer here. These are high voltage polyester film type, but are usually listed...

Anyone else attending this year's Burning Amp Festival? I plan to bring my β24, β22, γ1, γ2, Mini³, θ19 speakers, LCDuino-1 prototype, and other stuff. If you live in the San Francisco Bay Area, this is an audio DIYer's event not to be missed. Actually, a lot of people from other countries...

Last update: April 25, 2010 News - April 25, 2010: All future announcements and updates for the LCDuino-1 and related app modules (δ1 relay-based attenuator, δ2 relay-based input/output selector, and others) have moved to the new AMB DIY audio forum. We have an entire forum category...

Awaiting for AT&T repair service on my DSL and telephone lines which experienced a sudden outage today. Hope that the site will be up again very soon. Sorry for any inconvenience... FYI.

NorCal Summer Meet Saturday 6/28/2008 impressions The meet hasn't even started yet as I type this, but I figure'd why not jump the gun and start this thread. EDIT: Oops. Looks like there is already a thread here -> http://www.head-fi.org/forums/f45/ca...a-meet-339065/ EDIT2: OK...

Any interest in a circuit that lets you use momentary switches (such as the attractive Bulgin vandal-resistant pushbuttons) as the main power switch of an amp or other device? Here is a solution that also has a couple of extra features thrown in. HeadWize: DIY Workshop > ε24: Power switch...

I am planning the prototype build for my β24 poweramp. Since it would be unwieldy to have separate PSU and amp cases for a large unit like this (and the high-currents involved would make an umbilical/connector difficult), it will be a single-chassis solution. My plan this time is to use a...

I just posted my latest project, basically a β22 on steroids, as a dedicated speaker amp, with a few new twists thrown in: HeadWize: DIY Workshop > β24: A discrete, cascoded, fully-differential power amplifier Have a look!

I made this post on headwize which may be of interest to head-fi DIYers who don't frequent headwize often.

Does anyone have, or links to PSpice models for the 2SK170 and 2SJ74 jfets? I've been using the J210 and J270 as a substitute but they aren't the actual devices I'm going to use... I'd be especially interested in the models for these in the -BL Idss class. Google search yielded a 2SK170 model...

I've used a high quality input selector rotary switch on my DIY preamp before (made by Alps, has sealed contacts, compact body, and purchased in Taiwan many years ago), and now I can't find a source for these any more. Anyone has any leads? I am looking for one in 2-pole, 5-position. The...

I present to you the ε12 ("epsilon 12"), a turn-on delay muting and DC offset protection circuit designed specifically for headphone amps. It prevents the turn-on "thump" and turn-off noise present with some amps, as well as provide protection to the headphones in case the amp's output DC offset...

Now that people are beginning to receive their boards and parts, it's good time to close out the "M³ project announcement" thread and start anew here. Have fun building your new amps! Must-read links for builders: amb's M³ site Morsel's M³ site

Hi all, I just registered in these forums although I have been a long-time DIY audio fan. It's good to see many enthusiasts here engaged in the same art and science. Anyway, I have just completed my rendition of the SDS Labs headphone amp. A photo is included below, more pics and info are...