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On Friday 10 January 2025 03:18:30 pm wn4isx via groups.io wrote: > BTW, I have a no name "made in West Germany" personal alarm that uses 6 AA cells, and has a battery powered siren. I found this

Oh and 130dB will attract all the police within about a mile.

Did you leave out a series resistor for the LED? While you can power a LED from a button lithium cell because of the high internal resistance will limit the current, 3 or 4 NiCads will dump a lot of

Uploaded to /Sabre Zapper.pdf. D

The following items have been added to the Files area of the [email protected] group. * /Sabre Zapper.pdf ( /g/electronics101/files/Sabre%20Zapper.pdf ) *By:* Dan Kahn

Done! D

So much for showing the diagram. D

put (upload) the PDF here ! /g/electronics101/files tks

Yeah, but this group doesn't accept attachments and will silently strip them from messages... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this

My sent messages shows the pdf file sent. Dan

Just checked again and the cap is 684nFd and the 730 nFd that I calculated is within 10%. Close enough for normal EE. I must be showing my 84 years, Dan

hello where is the file ? tks

Here is a schematic I reverse engineered. On Friday, January 10, 2025 at 11:01:52 AM EST, Roy J. Tellason, Sr. via groups.io <roy@...> wrote: Yeah,? there is that.? I

Thanks for getting back to me Roy. Yes all values for the cap are nFd. I like the additional resistor on the bridge input. I can probably find a place to add this without taking up too much

Yeah, there is that. I have a Simpson DVM that uses four fat nicads to power it, and I'm on my second or third set of them so far. And they're not in good shape. The original charger for that was

Is that uF or nF? That's higher than the 680nF you mention above...

Yeah, I should probably try some of that stuff. It's been so long since I built that I don't recall what's in there. But looking in my files I found the booklet that came with it. It's their

Capacitors act like lossless resistors at AC. It's called capacitive reactance. https://en.wikipedia.org/wiki/Electrical_reactance covers both capacitive reactance and inductive reactance. This web

I am working on a Sabre Flashlight/Tazer combination.? The LED has shorted but that is not the reason for this post.? The charging circuit is very simple.? The line voltage goes through a 684nFd

Add a 1000uF (or higher) capacitor across the V+ rail to ground. Look up the spec sheet Different manufacturers might have minor