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Project SPH-30X/8
Hi guys I've just finished a pair of small desktop speakers with the driver Monacor SPH-30X. This little 3" full range has gotten some pretty good reviews and I must say it sounds promising and with...
View Article6GK5/300B
I was considering building a 300B push-pull amp with a pair of 6GK5's set up as a LTP with a CCS and a negative rail. My operating point was going to be 350V P-K, 71V bias, and ~80mA per tube into a 5K...
View ArticleSeas Excel W22's in open baffle, need more midbass "oomph"
I've been experimenting with open baffle for quite some time now, first with two Seas Excel W22's mated with a Vifa XT25 tweeter per channel. Midrange was severely lacking so I added a Seas Excel W15CY...
View ArticleMarantz pm57 distortion
I have distortion in both channels through the speakers, when I turn it up a little. Its ok at low vol, and fine at any vol through headphones. I have cleaned the relay connections, and checked for dry...
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Virtual Ground (A Regulated Rail Splitter)
A Regulated Virtual Ground and Rail Splitter This circuit enables a DC power supply or wall adapter with a two conductor output to function as a split supply with a three conductor output (i.e.,...
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Dumb Directivity Question
When building a loudspeaker with a waveguide, I know that it's a good practice to have the woofer and the waveguide use the same diameter, and to have a center-to-center spacing of one wavelength or...
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Top aluminum plate from ProtoPanel.com
I just received mind today and I am excited to say that is of good quality. It took two weeks to get it. I have no business relation with ProtoPanel. Just wanted to let everyone interested know that...
View ArticleCan we improve the PCM2707 ?
Hello I have few PCM2707, the jitter numbers of that chip are not very good, can we improve it ? I would use it as a USB to SPDIF converter. I want to use my Apple iBook G3/300 (OS 9.2.2) to do a low...
View ArticleAudiolab 8000A low volume from cd input than tuner input
Strange issue: I tried to do a comparison between 2 different cd players on how they sound, so i connected them to the cd and the tuner inputs of the Audiolab 8000A (early version). The player that is...
View ArticleUsing Arduino for Syncronous motor speed control
Many of us have Premotec, McLennan etc 230/110v ac syncronous motors driving our TT's. The professional controllers are expensive (and possibly rightly so). So a good (free) flexible controller design...
View ArticleSome dumb rookie questions about output power
Ok, the first question is a really basic one that I'm 99% I know the answer to, but none the less..... Say I have 18v rails. The power transistors at most only ever see a Vce of 18V right, not 36? (In...
View ArticleTube testing 101?
Hey there, I have done a search and I've looked into the stickied noob thread, but I wonder if someone more experienced has a quick link. I have to admit years of addiction to tube audio, both in hifi...
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The Napoleons: a Compact 2 Way that punches above its weight
The Napoleons are a small DIY loudspeaker designed to deliver a natural tonal balance and clean loud playback from of a small box suited to both small and large rooms, at a reasonable price. This write...
View ArticleIC's get hammered
I was doing some research as part of the work on my new pre-amp, which uses a modular gain stage design (both IC version and discrete version using LSK389). My main reason for the modular gain stage...
View ArticleGalvanic Isolation for WordClock?
Hi! Is there any commercial solution for galvanic isolation of wordclock connections? If not: Whats the suitables pulse transformers to build this by yourself? Thanks and Regards, Elektrohamster
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New Sure TDA7492
recently I ordered this amp sure to electronics. 2 X 50Watt Class D Audio Amplifier - TDA7492_Special Offer_Sure Electronics' Webstore In the past I had a customized (reduced input resistance) TA2024...
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Transformer calculations for Jlh for quad esl amplifier
Good evening gentlemen, I'm making calculations for the transformer of this amplifier (to aproximate the total costs of the wire) for the 28W at dual rail 23v at 3.7 amps bias. I have allot of...
View ArticleOatley K272 DC power options.
Few questions if you dont mind. I would like build the Oatley K272A Headphone Amplifier Oatley Electronics but would prefer to use mains powered supply. Having looked at the kit and done a bit of...
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Overstock.com kl-2400
Thought I would pass this along as I have one, photo attached, KLH KL-2400, on overstock.com for 70 bucks. The preamp sucks but if you bypass it, it is a pretty good amp, even better it has a nice...
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