Small title bar4

Dick Moore photo 150 Tronola is pleased and honored to republish here, in its entirety, the sterling website Dick Moore created over a decade in his retirement. We are grateful to his lifelong companion and wife, the Reverend Robin Moore, for her kind support in this endeavor. We are also indebted to Tronola author, Arthur Grannell for his generous efforts to facilitate this publication. Finally, we would like to thank Larry Burk, who first introduced us to Dick’s work, back in 2012.
Electronics enthusiasts lost a great friend and contributor in November, 2015. Dick Moore had been actively helping and creating in the audio e­lec­tron­ics field for over fifty years. He once worked with Paul Klipsch and among other things, worked on positioning the drivers in the famous Cornwall speakers. I knew him through his remarkable series of “greenings” of the Heathkit IG-18 audio generator, which happily intersected with our own efforts, as related in our Tronola article on the subject. Our focus here belies the rich life Dick led and you can find out more here.
— S. Lafferty, December, 2016


  Home -- article index
  60kHz Shielded Loop Antenna             updated 10-16-2010
  GPS-Disciplined 10MHz Oscillator 1             updated 9-6-2008
  GPS-Disciplined 10MHz Oscillator 2             updated 4-14-2014
  Heating/Cooling Load Calculations             updated 6-16-2013
  Hot-tub PID Heater Control             updated 1-11-2012
  Hot-tub PID Heater Control Rebuild             new page 4-15-2012
  Pure beauty: The Sine Wave             created 11-11-2014
  About RC Oscillators             updated 10-26-2011
  Lamps for Stabilizing Oscillators             updated 10-9-2011
  Heath IG-18 Oscillator #1 -- re-greened original             updated 5-23-2011
  Heath IG-18 Oscillator #2 -- Cordell's SV design             rewritten 6-29-2012
  Heath IG-18 Oscillator #3 -- HP's 339A design             updated 6-11-2012
  Heath IG-18 Oscillator #4 -- HP 339A variant             created 6-14-2012, updated 8-11-2012
  About Total Harmonic Distortion Analyzers             updated 4-28-2015
  Active Twin‑T Notch Filter             updated 12-16-2014
  Greening the HP 334A Distortion  Analyzer             complete rewrite 6-25-2012
  Mod of Heath IP-2718 Triple Output Power Supply             updated 6-18-2011
  Repair & Mod of GR 1562‑ ;A Sound Level Calibrator             updated 7-26-2012
  Received Wisdom
      Welcome. Please post below if you have any questions about stuff on the site.

Spring rhody

Spring rhododendron in Grapeview, Washington, USA

© 2005-2015 Dick Moore   


Reader Comments

Posted by Steve Lafferty August 06, 2020 - 06:49 pm
Hi Chris, I take it you came here because of Dick Moore's article, "About Total Harmonic Distortion Analyzers," linked above, where he discusses the Sound Technology ST-1700 and light dependent resistors (LDRs). While I don't know of a source for the ones used in the ST-1700, I have built an LDR in the past by combining a cadmium sulfide photocell and an LED, covered with heatshrink. The photocells are readily available, such as this one: If you try that, please come back and let us know how it works in the ST-1700. I will be happy to help if you any other questions. Best wishes, Steve

Posted by Chris Cecil August 06, 2020 - 05:31 pm you have any ideas on a source for replacement LDR's for ST 1700's
Chris Cecil

Posted by Steve L. March 19, 2020 - 04:22 pm
Hi Mark,
Thank you for your kind post. I'm sure Dick would be very pleased to hear it.

Posted by Mark - AA7FY March 19, 2020 - 04:00 pm
Your IP-2718 mod was brilliant. My power supply is sooooo much better.

Posted by SyncTronX April 21, 2018 - 07:04 pm
I am glad Dick's passion could be captured and saved here.
We miss Dick a lot.

God Bless,


Posted by Steve L. February 24, 2019 - 07:25 am
Hi David, Thank you for sharing your thoughts. By the way, Tronola includes a broad field of electronics-related topics, so we would enjoy hearing more about your new developments. For example, there is the recent article, "The Time Machine," which (in a vintage kind of way) ties-in with Dick's "GPS-Disciplined 10MHz Oscillator."

1 - 2 - next> - last>>

Add your comments here...