Hi all! Since more and more IC's, especially Opamps are not produced in DIL packages anymore, but instead in SOIC packages, I decided to make some adapter PCB ...
Hannes, This is a good idea, but I would like to make one suggestion. Instead of laying it out as you did, put the op-amp on the bottom side and twist so the...
Hi Charles! ... Thank you for the suggestion! Actually I was pondering over the layout almost over the whole day. Tried several versions, but to reduce cost I...
Hi Hannes: It seems you have way more vias than needed, like all of them. Why not single sided? Any idea of where to get the SIP type pins used on Surfboards? ...
... (snip) Have you considered the additional capacitance this layout adds between the normal dual opamp output pins, and the non inverting input pins?...
Hi Hannes, I'm unclear why you went to a two-sided board. My intent/sketch was a one sided bd where you build the SOIC on the pin side and solder everything...
Hi Hannes: I asked the people that make the Surfboards and they would not tell me their source for the SIP pins. Have Fun, Brooke w/Java http://www.PRC68.com ...
I sometimes use the inexpensive Brown Dog SOIC8-DIP8 adapters: http://cimarrontechnology.com/index.asp?PageAction=VIEWPROD&ProdID=12 Or I make my PCBs so that...
I have a kit that i am putting together....it is the FQS-003 parts kit for the SCL-007 Gradiometer......I have the circuit built and mounted in a Pelican Case...
... In general, there are no low level signals in the FGM-3 connections, unless you are using the internal bias coil. Other than that signal, there is only +5,...
ok , John, thanks very much for the info.....I will be sure and install the Caps on the FGM-3 units and I will use 2 sets of 3 wires as you suggested....thanks...
Hello everyone, My BAA Radio Astronomy Group mentioned a site of German aurora monitors called SAM. I checked out the link and see they are using the FGM-3...
Just curious. I am about to put this kit together, and wonder if anyone has actually done it. No circuit schematic or explanation came with the kit, and the...
Hi: I don't see the pots you mention at: http://www.fatquarterssoftware.com/downloads/scl007.pdf Where do you see them? I think the IC is a PIC micro...
Hi all (and hal) Mrs Kern (FQS here) - Erich is sick at the moment or he would be answering these question for you. He will be home from the hospital in a week...
Hi all (and hal) Mrs Kern (FQS here) - Erich is sick at the moment or he would be answering these question for you. He will be home from the hospital in a week...
Laurie: I wasn't trying to put any pressure on you or Erich, quite the opposite. Just trying to see if anyone else knew, so any pressure would be OFF you and...
Right, Brooke, Speake just shows the two inputs (presumably different- period square waves) going into their ASIC (which may well be a programmed PIC or other...
Well, one mystery gets solved. The Speake gradiometer datasheet has a phrase in one sentence that notes that the signals from the two sensors are time...
Hi Hal: If the IC is a PIC 16F84A (just a guess based on matching pinouts for power, crystal and I/O pins then the two sensor inputs go to RA0 and RA1. These...
Brooke, that's all quite reasonable. 1. The conjecture that it is a 16F84 or equivalent is reasonable. Both the pinout and the fact that that is the most...
Hi Hal: The 16F84(A) used to the the choice for hobbyist projects, but now it's obsolete. The closest today maybe the 16F88. The data sheet for the SCL-007...
Have just been looking at the X-ray of the FGM sensor - very impressive. Would anyone care to guess-timate the number of turns in those coils ? Colin...
... I think it is very possible. When I studied the x rays, closely, I convinced myself that besides the windings of fine wire, there is a spiral of much...
HI John: I agree, and it's probably Metglas. Have Fun, Brooke Clarke w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml ...
... Probably so. it can be made with a nice square BH loop and is pretty insensitive to being bent a little, compared to Permalloy and other nickel alloys. I...
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