Low pass filter
my question is that I used the low pass filter topology sallen-key with tda2030 and ne5532 to use as 2.1 system for computer and when tested the sound still coming out from the woofer , is that right...
View Articlestupidly simple LED dimming from DC heater supply?
Almost all the info on LDR's here on this site involves trying to get stereo to track properly in ultra hifi... I'm just looking to dim 3-4 ma worth of optocouplers, all together, as one, on the same...
View ArticleIts time for new speakers! Suggestions?
Hey everyone, I've recently sold my diy speakers to a friend of mine in need of some quality sound. The speakers were a set of fr125 based mtm's with some cheap hivi tweeters in 14 liter sealed...
View Articlejbl 2245h amplified by F4
Hello people i want to ask if anybody know if nelson pass F4 in bridge can be the amplifier for jbl 2245h without an preamplifier ? I put the 2245h in open baffle and i guess the F4 doesn't have enough...
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How to change the needle on your Clearaudio MM for 30 euros
Disclaimer... This applies to Clearaudio Virtuoso. Possibly for Maestro and the other MMs as well as some other guys report, but I cannot verify this... This is strictly personal experience. Not at all...
View ArticleTesting 3B22 on Hickok 752a
Hello, I'm very new here and hope I am posting in the correct forum. I have a 3B22 rectifier and would like to test it with my Hickok 751A tester, but cannot find any information on the roll chart and...
View ArticleOnkyo M-504 troubles - need some advice
I have an Onkyo M-504 I bought back in 1987. It has not caused me the slightest of any problems for 26 years, till now. It has been a great amp and has powered a pair of Klipsch Forte's and later a...
View ArticleJordan jxr6, seas fu10rb and others for mini sealed box...
Hi, I'm just asking if anybody has had any experiences with these drivers or similar to build in a sealed cabinet. These are the drivers I've come up to: Jordan jxr6 and seas Fu10rb h1600 04 There is a...
View ArticleAnyone remember?
Years ago I built a diy copy of an odd speaker design for a mate, it had an upward firing bass unit on the top and and a tweeter on the front, does anyone remember the name of the commercial design? I...
View ArticleAmp for electric violin / cello.
Hi, I am starting a new project for my o/h and aim to build a small valve amp for her. She wants initially to be able to play her electric violin through it and she has plans of getting an electric...
View Articlebest PC audio Extraction system
Hi, sorry for the basic question, but I am new of this matter. So I have my old beloved CDs from the 80s and I do realise that they will not last forever. I lost already a first edition of Pink Floyd´s...
View ArticleFirst Build - FH3
Just built my first pair, FH3 and enjoying them, lovely design and sound even from a wireless sytem. Thanks to FH3 for all the help and the provision of the cad files, I am enjoying the final result of...
View ArticleMDA fuse for a glass fuse.
I have an mda fuse in one amp that blowed up. Can I put a 250v glass fuse in its place ? is the mda slow blow or something ? Thanks. Cool. Srinath.
View Articletaking the gain pots out of the "mix"
I run the music elective program as artist in residence at Wyncote Academy. Most private schools have no music budget so I bought a cheap Technical Pro TA1250 power amp and then removed the gain pots...
View ArticleSpeaker replacement
Anybody here have an idea of where I course source a replacement driver similar to this one here? I have searched the web high and low and can't fins an exact replacement and am looking for a...
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All-In-One Preamp Circuit
Attached is the schematic for the current implementation of an All-In One solution for MM phono and various inputs on one PCB with common shunt regulator for both channels. The line amp section has...
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USB A to B cable shield connection, how?
Hello all. I want to connect my DAC to a iMac in another room through the USB and control the music playback with Remote App on iPad. DAC is operating as an asynchronous USB Audio 2.0 class device, the...
View Articlequestion about transistor package types
For the various medium to high power transistor package styles that have some sort of metal heatsink mounting tab (to-220, to-126, to-246, ect), is that tab electrically isolated from the actual...
View ArticleMini dsp 2x4 output buffer
I have a Minidsp 2x4 (V1.5) that I want to use in my system. Configuration is Source Preamp/source selection Vol control PGA2311 LCD Volume Remote Control Gold RCA Jeff Rowland | eBay Minidsp Ucd400...
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