Bob Boyce update

[kevinsatterfield]

[glenn_aircooled]

[kevinsatterfield]

[chemelec]

[Big-bubbles]

[Bob Boyce]

[Looking In]

[chemelec]

I am not trying to put anyone down on this, I am just trying to HELP those persons who have buit this to get it Operating properly.

Anyway I have recieved Two of the PWM3F boards in the mail from a person that Built them and couldn't get them to work.

One of them, he has Totally Fried it. The Other is Repairable.

In order to Fix this one, I did some serious investigation of the schematic and the circuit board. Sorry, I'm Not very Impressed.

1) Looking at the Schematic, I have found some Errors on the pinout of the opto isolators.

2) Even with these resistor and capacitor changes as shown here and elsewhere in this topic, it will not work properly, if at all.

****************************************
QUOTE:
** CAP CHANGES:
channel 1- 0.0047uf
channel 2- 0.01uf
channel 3- 0.047uf
RESISTOR CHANGES:
R4,R5,R6- 10k to 1k
R7,R8,R9- change to zero ohm jumper wire.
****************************************

3) The 100K trimpots for adjusting the Frequencys are Too Large of a values. Making it Totally Impossible to accurately tune this circuit to the required frequencys.

I have now revised this circuit so it will operate and allow for a More Reasonable Adjustment range on the frequencys.

I do Not have any Specifications for the "Specific Function" of U1b, U2b or U3b, so I can't address the issue with these as to weither they function correct or not, with the values shown.
** So I won't comment on this section at this time.

I Still have a few Details to work out but I should have these done in a day or two.

I am NOT Posting the detail of my changes on here, But I will give them out to persons who email me and ask for them.

Take care.......Gary

[kevinsatterfield]

I have 2 PWM3 boards and they both have tuned in with no problem,all 3 channles and put out the required pulse train with no problem.Its kind of a shame that wires have been crossed here with few members and we're not all a happy family but as many members here and everywhere else that are building and working on these things it's understandable i guess.I hope it doesnt come down to "mines better than yours" kinda thing.Iunderstand why and how ppl get aggravated and Im start'n to see alot things Im not very proud to surround myself with and thats a shame as well.One thing is for certain, there is only ONE judge in the end.

[gagekko]

[Bob Boyce]

[AlaskaStar]

[chemelec]

[Bob Boyce]

[mrgalleria]