- Winfing a High Ratio Transformer - 1 Update
- Fiber brush for circuit boards - 4 Updates
| "amd...@gmail.com" <amdx62@gmail.com>: Oct 16 06:04AM -0700 Sorry using GG, I have newsreader problem after updating Thunderbird, I haven't solved yet. In a thread about a low impedance transformer for a Q meter, it was suggested two cascaded two 10 to 1 transformers to get 100 to 1 ratio. 3C90 material was used. I have 3F3 that is similar but a little lower ui. I'm hoping flat 100kHz to 100MHz, but really only need 30MHz. I have pot cores, are there any tricks to winding that will make for better coupling or less strays? Is there any advantage to a wide band for the one turn secondary vs a single 22 gauge wire? I have copper strap or brass shim stock. Put the one turn on outside, on inside? I have room for 12 turns, put the one turn right in the middle, 5 turns on each side? I've built one, but I need a better jig to measure with the NanoVna. Parts on the way. Thanks, For you input, Mikek |
| Jeff Liebermann <jeffl@cruzio.com>: Oct 15 11:14AM -0700 On Sat, 15 Oct 2022 06:55:28 -0700 (PDT), "ohg...@gmail.com" >I'd like to buy a few to keep on hand in case I lose another, but I don't want to spend a hundred bucks for 5 brushes that are worth a couple of bucks each. >Does anyone know of a similar brush that I can buy to replicate the function and durability of the Chemtronics brush? I sent Chemtronics an email but I doubt they will sell the brush separately, otherwise I'd buy a dozen or so... >Thanks. Looks like Chemtronics sells a flux cleaning system based on that brush but doesn't sell the brush separately: <https://www.chemtronics.com/brushclean-system> <https://www.chemtronics.com/spot-cleaning-flux-residues-using-brushclean> If it's fiberglass bristles, you could just buy some "acid brushes": <https://www.google.com/search?q=acid+brush&tbm=isch> and insert your favorite bristles borrowed from a scrub brush. The original "horsehair" bristles are probably too thin. This might work, but the bristles appear to be too large diameter: <https://www.zoro.com/schaefer-brush-mfg-llc-fiberglass-flux-glue-dope-brush-tin-10033/i/G9502757/> -- Jeff Liebermann jeffl@cruzio.com PO Box 272 http://www.LearnByDestroying.com Ben Lomond CA 95005-0272 Skype: JeffLiebermann AE6KS 831-336-2558 |
| rbowman <bowman@montana.com>: Oct 15 12:27PM -0600 > I'd like to buy a few to keep on hand in case I lose another, but I don't want to spend a hundred bucks for 5 brushes that are worth a couple of bucks each. > Does anyone know of a similar brush that I can buy to replicate the function and durability of the Chemtronics brush? I sent Chemtronics an email but I doubt they will sell the brush separately, otherwise I'd buy a dozen or so... > Thanks. amazon.com/Fiberglass-Scratch-Brush-Pen-applications/dp/B07S3RCTGZ/ The Amazon link is for reference. Auto body repair shops use scratch pens for cleaning up stone chips and so forth so you can find them at any autp parts store. |
| Bob F <bobnospam@gmail.com>: Oct 15 01:08PM -0700 > I'd like to buy a few to keep on hand in case I lose another, but I don't want to spend a hundred bucks for 5 brushes that are worth a couple of bucks each. > Does anyone know of a similar brush that I can buy to replicate the function and durability of the Chemtronics brush? I sent Chemtronics an email but I doubt they will sell the brush separately, otherwise I'd buy a dozen or so... > Thanks. https://www.amazon.com/flux-brush/s?k=flux+brush |
| John Robertson <jrr@flippers.com>: Oct 15 11:29PM -0700 On 2022/10/15 1:08 p.m., Bob F wrote: >> I'd buy a dozen or so... >> Thanks. > https://www.amazon.com/flux-brush/s?k=flux+brush We bought some of those, they are somewhat soft, like paint brushes, not very stiff as the OP is looking for. John :-#(# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
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