Very interested by his design of a THD meter I tried to contact him via email but to my disappointment he did not respond.
So I decided to make a copy of his published PCB layout with fritzing and, approaching the finished layout, I was wondering
if somebody else on this forum did not already do this and gained some experience with that design.
Hope someone will respond.
So I decided to make a copy of his published PCB layout with fritzing and, approaching the finished layout, I was wondering
if somebody else on this forum did not already do this and gained some experience with that design.
Hope someone will respond.
Nice PCB,s but his design can be bettered in performance , JLH designed a THD meter that goes down to 0.001 THD and there are others.
O.K. It would be nice if you can supply some more information about these.
But....... THD down to 0.001 %......
I am not looking for that accuracy 🙂
Here is one circuit using OPA2134,s-
Distortion Analyser
There have been a series of THD meters in EW articles back in the 70,s-90,s.
Distortion Analyser
There have been a series of THD meters in EW articles back in the 70,s-90,s.
While looking up THD analyzer circuits I came across an anomaly in that good American website that has many US/UK magazines on all radio/audio etc topics .
On checking up on JLH,s THD meter that will test down to =0.001 % THD I found the EW edition for February 1998 had been removed .
I think this is for commercial reasons and has been requested to be withdrawn .
As I actually built it and yes it does work I have the actual EW magazine somewhere but that's only in the last month this has happened.
I do not believe in co-incidences but I along with others praised the website for its articles not long ago-- so-----?
On checking up on JLH,s THD meter that will test down to =0.001 % THD I found the EW edition for February 1998 had been removed .
I think this is for commercial reasons and has been requested to be withdrawn .
As I actually built it and yes it does work I have the actual EW magazine somewhere but that's only in the last month this has happened.
I do not believe in co-incidences but I along with others praised the website for its articles not long ago-- so-----?
Thanks duncan2 for supplying that "Distortion Analyser" link.
I find it a little bit of a setback that there is no PCB design of it available.
Have to fiddle out this myself I am afraid. Takes some time......
I find it a little bit of a setback that there is no PCB design of it available.
Have to fiddle out this myself I am afraid. Takes some time......