Feedback Instruments DPM609 Digital Phase Meter - UK Vintage Radio Repair and Restoration Discussion Forum

Chris55000 · 15th Mar 2019, 3:40 am

Hi!

I purchased one of these Feedback Instruments DPM609 Digital Phase Meters cheaply for experimental audio work, and I will provide a write–up of it when I get the time to do so, but in the meantime, may I draw the attention of Members to the June 1991 issue of Elektor UK magazine available from American Radio History?

This issue has a full project on a Digital Phase Meter that can be constructed by anyone here familiar with simple analogue and 4000–series logic circuits, and clearly explains the principles involved in accurate digital phase measurement.

No special software or programmed devices are needed to construct & use this instrument by the way!

Chris Williams

Chris55000 · 16th Jul 2019, 8:37 am

Hi!

Information on the DPM609 for anyone who wants it - I promised this as soon as I could arrange something!

Chris55000 · 16th Jul 2019, 11:15 am

Hi!

By the way, just to clarify a point, FB Instruments use two-letter reference designations for their ICs on their diagrams, so on the DPM609 circuit I posted it's not a "BC351" ic, it's circuit reference BC, type LF351!

Chris Williams

15th Mar 2019, 3:40 am	#1
Chris55000 Nonode Join Date: Aug 2007 Location: Walsall Wood, Aldridge, Walsall, UK. Posts: 2,866	Feedback Instruments DPM609 Digital Phase Meter Hi! I purchased one of these Feedback Instruments DPM609 Digital Phase Meters cheaply for experimental audio work, and I will provide a write–up of it when I get the time to do so, but in the meantime, may I draw the attention of Members to the June 1991 issue of Elektor UK magazine available from American Radio History? This issue has a full project on a Digital Phase Meter that can be constructed by anyone here familiar with simple analogue and 4000–series logic circuits, and clearly explains the principles involved in accurate digital phase measurement. No special software or programmed devices are needed to construct & use this instrument by the way! Chris Williams __________________ It's an enigma, that's what it is! This thing's not fixed because it doesn't want to be fixed!

16th Jul 2019, 11:15 am	#3
Chris55000 Nonode Join Date: Aug 2007 Location: Walsall Wood, Aldridge, Walsall, UK. Posts: 2,866	Re: Feedback Instruments DPM609 Digital Phase Meter Hi! By the way, just to clarify a point, FB Instruments use two-letter reference designations for their ICs on their diagrams, so on the DPM609 circuit I posted it's not a "BC351" ic, it's circuit reference BC, type LF351! Chris Williams __________________ It's an enigma, that's what it is! This thing's not fixed because it doesn't want to be fixed!