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SyncTronX SyncTronX is offline

diyAudio Member


About Me

  • About SyncTronX
    Too many projects, so little time.
    Cubs Win! 108 Years - anguish no more.
    Music, Amplifiers, Good Sound,
    United States
  • Signature
    -- Sync


Total Posts
General Information
  • Last Activity: Yesterday 11:54 PM
  • Join Date: 9th October 2008


Showing Friends 1 to 10 of 14


View SyncTronX's BlogRecent Entries
Latest Blog Entry

Posted 17th May 2017 at 10:37 PM by SyncTronX Comments 2
Posted in Uncategorized
JFET Amplifier and Filter Project.


A lab was developed with something a little bit more hands on for participants than just blindly doing the NIDA labs. We would benefit from making an N-Channel JFET amplifier and asked if we would be interested. Of course, we werent told the JFET type or gain and didnt know wed also include a bandpass filter. These parameters wed have a drawing from which to choose. Finally, wed have to document and report the entire process in APA format.

Each project is unique and provided on two stapled pages placed upside down in a mixed pile at the front of the room. Each participant was asked to come up and draw their project. I drew project labeled E on the upper right corner of the second page. Included were the following: JFET 2N5485 or 2N5458, Gain set to 22, the Bandpass to be 15kHz 30kHz, and Total Circuit DC Power as Calculated/Measured.
Other resources were...

Posted 1st February 2017 at 07:59 AM by SyncTronX Comments 0
Posted in Uncategorized
Over in the Low-distrotion, Audio-range,
Oscillator thread (LINK) some posts
about getting lower distortion before taking
the measurement of a DUT (Device Under Test).

Our own RNMarsh posted some good results
running his Panasonic through a miniDSP
box configured as a Low Pass Filter.

He had good results. So I thought and told him
so, and suggested he might get better results doing a band pass filter.

So instead of doing my diode homework for
my Solid State Devices class, I thought I'd
better check, that is put up for shut up.

So, I did and here is what I discovered:

Before filtering:

Posted 27th December 2016 at 03:12 AM by SyncTronX Comments 0
Posted in How To
How to set up the spell checker.


Spell check is NOT in the DIYAudio software,
it is part of your browser.

Set up is simple. Follow these
general steps:

On the menu bar select and hold tools:

Then, drag down and selection Options:

Then from the tool options scroll down and select Advanced:

Then at the bottom click on the check box, to
put a check in it:

Close the window, restart your browser, that is it.

Posted 29th November 2016 at 12:42 AM by SyncTronX Comments 10
Posted in How To


The HP339a was a state of the art (SOTA) distortion analyzer in the 1980s.
It is a full featured all-in-one product including a volt meter,
low-distortion oscillator, distortion analyzer, AM detector, and VU meter.

There was an in-depth analysis of low distortion oscillators
on DIYAudio on the following link:

<Low-disortion Audio-range Oscillator>
This was followed by a specific HP339a thread, linked here:


This is a summary of those threads along with the links, conversations, and
posts, about the research and development that went into the suggested modifications to the venerable HP 339A.


Why HP 339A?

HP339A Post #78
Well, a stock 339A gives you a wide band ac voltmeter, an oscillator and analyzer. A stock one will do you pretty well as long as you have no interest in reading below...

Posted 18th December 2014 at 04:38 AM by SyncTronX Comments 0
Posted in How To
For those of use that use the QA400 FFT,
here are some tips that will help us use the
product and software for measurement.

Press the Ctrl key plus an Axis, Windowing, or Measurement soft switch parameter.

For example, PRESS Ctrl + .dBV brings up a
dialog box to set External Gain & Peak Display Format:

Ctrl + .dBr brings up the following:

Ctrl + .X Lin:

Ctrl + .X Log:

The Measurements soft switch parameters as follows:

Ctrl + .Pwr:

Recent Comments
Thanks Kasey.
Posted 22nd May 2017 at 03:13 AM by SyncTronX SyncTronX is offline
Nice job writing this...
Posted 20th May 2017 at 07:05 AM by kasey197 kasey197 is offline
Everyman, you are most...
Posted 10th April 2017 at 06:36 AM by SyncTronX SyncTronX is offline
thanks for this!
Posted 5th January 2017 at 08:50 AM by tschrama tschrama is offline
Just to let everyone...
Posted 27th December 2016 at 02:50 PM by SyncTronX SyncTronX is offline
Hide this!Advertise here!

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