Search found 385 matches

by Dave Dixon
Fri Apr 09, 2004 11:06 am
Forum: General Discussion
Topic: mixing DC power supplies
Replies: 4
Views: 822

Re: mixing DC power supplies

Probably - - BUT - - First you need to be sure that both power supply returns (-) are isolated. Have them each plugged in and turned on and check for continuity between the two power supply returns. If there is no continuity - you are in business. Most good power supplies have the return (-) isolate...
by Dave Dixon
Fri Oct 10, 2003 1:37 pm
Forum: General Discussion
Topic: looking for old power supply manuals or information
Replies: 2
Views: 874

Re: looking for old power supply manuals or information

Did you try manualsplus.com?? I replied
to a previous post about this.
Dave
by Dave Dixon
Fri Oct 03, 2003 2:10 pm
Forum: General Discussion
Topic: older power supply problems
Replies: 3
Views: 708

Re: older power supply problems

I think the manual is available at
manualsplus.com. I hope this helps.
73's de Dave
by Dave Dixon
Fri Sep 12, 2003 9:07 am
Forum: General Discussion
Topic: Single Inversion Discrete Circuit
Replies: 6
Views: 1123

Re: Single Inversion Discrete Circuit

That sure seems correct to me. (90 per cent
sure at least) I remember building one in the
80's to listen in on the detectives who used
it on the police band! Those were the good
'ole days!!
Good luck,
Dave
by Dave Dixon
Wed Aug 20, 2003 2:42 pm
Forum: General Discussion
Topic: making p.c.b.'s layouts
Replies: 3
Views: 950

Re: making p.c.b.'s layouts

Craig,
I sent 2 e-mails to the hotmail address that
you gave me. Did I get it wrong? I can't
promise that I can help, but need a few answers
first on your board needs.
Please email me at [email protected].
Dave
by Dave Dixon
Fri Aug 15, 2003 1:32 pm
Forum: General Discussion
Topic: PCB Layout, Strategies
Replies: 3
Views: 1768

Re: PCB Layout, Strategies

Lien,
National Semiconductor's website has a
document called "Layout Guidelines for Switching
Power Supplies" with pictures and everything :)
Search for their application note AN-1149.
www.national.com/an/AN/AN-1149.pdf
Good luck,
Dave
by Dave Dixon
Wed Aug 13, 2003 12:55 pm
Forum: General Discussion
Topic: Best AM Broadcast band Radio for dx?
Replies: 10
Views: 6913

Re: Best AM Broadcast band Radio for dx?

Hi Mike, I agree with the posters who feel that the antenna is the most important element for what you are trying to do. I have used automobile radios in several projects because they were shielded better - designed for better rejection of noise. Once you have an external antenna hooked up, you may ...
by Dave Dixon
Tue Aug 05, 2003 11:16 am
Forum: General Discussion
Topic: making p.c.b.'s layouts
Replies: 3
Views: 950

Re: making p.c.b.'s layouts

Craig, How extensive a schematic do you have. I can probably find time if it's not very complex. I'll need packaging information for the specific components you want to use as well as the schematic. I'll also need to know what board dimensions and mounting hole locations if you know them. For fastes...
by Dave Dixon
Mon May 12, 2003 2:07 pm
Forum: General Discussion
Topic: Vacucoating?
Replies: 5
Views: 1126

Re: Vacucoating?

I just ran across an ad for INSULCAST Potting Compounds. Check out www.insulcast.com Their ad
mentions that they offer a free sample!!
Dave
by Dave Dixon
Thu May 01, 2003 8:48 am
Forum: General Discussion
Topic: Vacucoating?
Replies: 5
Views: 1126

Re: Vacucoating?

Hi there, This coating looks a lot like the stuff you can buy at any hardware store to coat tool handles for insulation. The brand I used before was called "Dip It", but I'm sure there are several other brands. If I remember it was only about $5 US .. Cheap enough to experiment with on a spare PCB! ...