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I am preparing the stuff I need to etch my own personal mark on a lower I am finishing from an 80% 7075 forging. I would like to avoid the battery charger as a power source, so I have looked at some plans for inexpensive home built units. Chris Crawford's plans http://chriscrawfordknives.com/#/ele...nit/4535265119 are quite simple and appear very easy to assemble as well as being very inexpensive. However the transformer he calls for is the 25.2V CT 2.0A Heavy-Duty Chassis-Mount Transformer with Lead from Radio Shack. Radio Shack does not have it available either in the local stores or online, seeing as they are going under who knows if or when they will be available. What can I use as a substitute? Or does anyone else have other plans that are as simple and inexpensive as this one? I'm not an electronics guy at ALL, so I need to ask.
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Our chief weapon is surprise, fear and surprise; two chief weapons, fear, surprise, and ruthless efficiency! Er, among our chief weapons are: fear, surprise, ruthless efficiency, and near fanatical devotion to the Pope! ...Oh, damn ...Um, I'll come in again. -
Mauser electronics is a good place to start -
If all you need is a 24v 2 amp dc power supply, ebay has plenty for $20 or less.sigpicComment
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The reason I wanted a replacement for that particular transformer is so that I can build an adjustable unit that also has an AC power setting. I do a bit of bladesmithing here and there and the AC is useful for blackening the etched mark on blades. I also want to try some of my own anodizing, and adjustability is very handy for that as well.
Mouser electronics probably has what I need, but the catalog is so complex that I'm unable to find it. I'll give them a call later today, thanks for the tip, kcstott.Our chief weapon is surprise, fear and surprise; two chief weapons, fear, surprise, and ruthless efficiency! Er, among our chief weapons are: fear, surprise, ruthless efficiency, and near fanatical devotion to the Pope! ...Oh, damn ...Um, I'll come in again.Comment
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I wasn't able to find an exact match thru Mouser. Digikey has this one, and the price is about right for that type of transformer. It is a 110v to 55v with 27.5v ct at 2 amps.
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After further review, I was able to find this, which might be a closer match to your original spec.
sigpicComment
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The AC function is always there.
The rectifier creates your DC power
use a toggle switch to switch a set of leads to either before or after the rectifier
Mouser part number 553-F41XLast edited by kcstott; 04-07-2015, 7:35 AM.Comment
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Outstanding. That looks like it will work. Thanks!
Our chief weapon is surprise, fear and surprise; two chief weapons, fear, surprise, and ruthless efficiency! Er, among our chief weapons are: fear, surprise, ruthless efficiency, and near fanatical devotion to the Pope! ...Oh, damn ...Um, I'll come in again.Comment
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Just make sure to use a linear power supply and not a switching power supply.Sig Sauer Certified Armorer, P-Series Pistols
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