Nelson Pass said:[snip]Multimeter - RADIO SHACK FOR $39 (think about a couple of these)
Soldering Iron - RADIO SHACK FOR $19
Variac - MARLIN P JONES FOR $39
Scope - ANYTHING DECENT you can get used.
1 MHz, 5 mV, dual channel, a trigger that works.
Everything else can be built with these.
... says the man with an AP in very room.
But yes, you can built pretty good amps with these tools, (plus a signal generator, perhaps) if you know how to use them best.
Jan Didden
As a personal preference, I like a faster scope; one fast enough to see any HF oscillation.
My favorite was the original Tek 475; last I checked, a new CRT was prohibitive though. And whilst I'm sharing biases and prejudices, I'd avoid the early digital scopes like the plague. Inadequate sampling rates and poor firmware made aliasing a real problem.
My favorite was the original Tek 475; last I checked, a new CRT was prohibitive though. And whilst I'm sharing biases and prejudices, I'd avoid the early digital scopes like the plague. Inadequate sampling rates and poor firmware made aliasing a real problem.
God help me, but I just broke my budget and bought one of these:
http://tinyurl.com/ybjpvt
What sort of hi-fi nut spends more money on test equipment than he does on actual audio gear? A DIY-er, of course! I couldn't hope to win the bid on a Heathkit AA-1800 power amplifier, not when I wanted this analyzer, too. The IMD capabilities are what grabbed my interest.
I guess I'll have to sell my two Heathkit distortion analyzer to help pay for this excess, but that's what Ebay is for, yes?
There are three of these Tektronix test sets left.
http://tinyurl.com/ybjpvt
What sort of hi-fi nut spends more money on test equipment than he does on actual audio gear? A DIY-er, of course! I couldn't hope to win the bid on a Heathkit AA-1800 power amplifier, not when I wanted this analyzer, too. The IMD capabilities are what grabbed my interest.
I guess I'll have to sell my two Heathkit distortion analyzer to help pay for this excess, but that's what Ebay is for, yes?
There are three of these Tektronix test sets left.
check
http://audio.rightmark.org
You will need buffers and a voltage divider if you want to protect the inputs of your sound card. The soundcard sampling ratye limits you if you want to do a THD plot all the way to 20k Hz.
However it's FREE. Not an unimportant consideration.
http://audio.rightmark.org
You will need buffers and a voltage divider if you want to protect the inputs of your sound card. The soundcard sampling ratye limits you if you want to do a THD plot all the way to 20k Hz.
However it's FREE. Not an unimportant consideration.
An approach to this could be one of the HP 400 series of AC voltmeters, that has an amplified output. A lot depends on how low the meter's noise and distortion is, of course. Heathkit's IM-5238 is a similar instrument, and I have won the bid on a unit on Ebay, so I will see how well suited it may be as a sound card "front end".
There is also http://www.audiotester.de
No free but fairly cheap. Documentation is in imperfect English. When reading it it's easy to hear it in a Schwarzenegger voice.
No free but fairly cheap. Documentation is in imperfect English. When reading it it's easy to hear it in a Schwarzenegger voice.
Hi all,
how about this one... worth the money and shipping cost?
grzz,
Thijs
Arggggg how do I get that link in my message
[url]http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7591259514&ssPageName=ADME:LBS:US:11#ebayphotohosting
how about this one... worth the money and shipping cost?
grzz,
Thijs
Arggggg how do I get that link in my message
[url]http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7591259514&ssPageName=ADME:L
BS:US:11#ebayphotohosting
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