C6 filters the reference voltage to the comparitors (from the adjustment POT). It does not need to be a tant, nor does it need to be 6.8uF. You could put a...
Aaron is right and I don't know exactly how to calulate the value so I have played around with different values for C6. No it doe not have to be a Tan cap....
Folks, Thanks for the comments. Knowing the function of C6 certainly helps with possible substitution solutions, and makes great sense in light of Ben's...
Yeah... yeah I know it's a cross-post, but I've got a headache that wont go away :-p Ben just had a production run on printed circuit boards to replace the ...
1. The generator circuit has 2 diodes (D4 & D5), to prevent ringing, IIRC. Since these are in series, wouldn't one of them be sufficient? 2. Are the 2...
Hi Ben: Will you be going to Cabin Fever, Jan 19,20,21? That is where I first got interested in EDM and I would like to just buy a board there if possible....
Bob Good questions Regards the J1 jack I suppose I should make it more clear in the drawing and text. I will change that in the next edition of the book, thank...
Thats OK Ben. I thought we as the 20th is My Birthday I will just take the end of the that week and go to Cabin Fever. Knowing that anyone with half a brain...
Sterilite Has some great plastic tanks that are cheap and will fill the bill. I am using several of them on an Anodizing line I have set up to anodize...
Thanks Bob if it helps other that is great. Ben ... From: Bob Engelhardt To: EDMHomeBuilders@yahoogroups.com Sent: Wednesday, January 02, 2008 7:42 PM Subject:...
Cabin Fever is fun if your into little gizmo's, and all kinds of machined stuff, working small engines, there are pictures on the site of some of the stuff on...
I had never heard the final word on the U1 12volt reg I did note that you used an National Semi Conductor LM7812SC Which I am sorry but it is ten times better...
PS Thanks for the great Updates Ben this means a lot to me at least. It sure makes everything you have done a class act. 1st class as well. thanks 73 dray...
A 7812 is a 7812. Well, maybe a Radio Dreck 7812 is different. But in any case, I would recommend the capacitor be made as large as possible to keep the 7812...
... True, but keep the VA rating nice and high and the regulation of the transformer nice and low - small transformers usually give very poor regulation. Steve...
It's not that I think the circuit needs extra capacitance, the circuit is missing capacitance that should be there. The LM7812 needs some output capacitance to...
You don't really need a large transformer on the 12 volt supply - it only has to supply current to the motor and controls. The circuit can't even draw the...
On page 100 of the book it is mentioned that diodes D4 and D5 are used to prevent ringing across the electrode which reduces wear. Would it also help to place...
I just went ahead and ordered the whole set of parts to propagate the complete board. actually it was much cheaper than ordering the parts from Radio Shack I...
... I would suggest caution, especially if UV exposure (as from an arc) is likely. The Sterilite- brand containers (polyethylene?) I've run into and used have...
This is something that we need to check on. To my knowledge 2 inches of Kerosene or water or just about any Liquid I can think of should completely stop all...
... I doubt it, there is virtually no inductance charged with current in this circuit. ... That would work fine. Check its regulated at the output. Steve...
... transformer ... It won't. It's fitted to ensure o/p stability of the 7812, but personally I have always found 78series regs to be very stable without. 79...
... only ... even draw ... than 20 ... The only benefit of a bigger transformer is the issue of regulation. Bigger transformers (or toroidals) have better...
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Are you basing this solely on the fact you didn't get a sunburn through a vodka bottle? Have you considered that the shape of the bottle might have more to do...
As I am building up my parts lists I noticed that there are power film resistors that are a little more compact than the two ohm 20 wire wound resistors. An...
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