Search found 293 matches

by gerty
Mon Nov 02, 2020 10:26 pm
Forum: General Discussion
Topic: Power Supply for mains circuit _linear or switch mode
Replies: 7
Views: 583

Re: Power Supply for mains circuit _linear or switch mode

Your AC currents will be different from your DC current. Here's some info to explain.... https://www.hammfg.com/electronics/tran ... /rectifier
by gerty
Sat Sep 26, 2020 1:23 pm
Forum: General Discussion
Topic: SRM motor
Replies: 3
Views: 737

Re: SRM motor

This is the first I hear of this, but then again, I've been retired for 3 years... I wonder what the pricing structure is like.. Apparently you'd be stuck using their controller, like it or not...Sounds interesting, motors and controls were a big part of what I taught...
by gerty
Sat Sep 26, 2020 1:35 am
Forum: General Discussion
Topic: Rewiring a battery charger
Replies: 5
Views: 748

Re: Rewiring a battery charger

You could use a bridge to get the 24 volts, but you would get screwy voltages at the lower settings, Is that an issue ? Does this have multiple taps on the primary ?..If it does the way they get the higher charging rate is by stepping up the voltage, and you could use that to your advantage to dial ...
by gerty
Wed Sep 02, 2020 2:04 am
Forum: General Discussion
Topic: Making PCBs at Home
Replies: 11
Views: 1133

Re: Making PCBs at Home

When I was teaching we made several types of boards using copper clad and etch available here....https://www.jameco.com/shop/StoreCatalogDrillDownView?langId=-1&storeId=10001&catalogId=10001&freeText=etch&search_type=jamecoall Also had a few students that used a wide "Sharpie" to draw out their circ...
by gerty
Wed Sep 02, 2020 1:52 am
Forum: General Discussion
Topic: LAX timing device is faulty, help me, I am grateful
Replies: 1
Views: 400

Re: LAX timing device is faulty, help me, I am grateful

We need more information than that..
by gerty
Wed Sep 02, 2020 1:42 am
Forum: General Discussion
Topic: 18 Volt Sub C NiCd Battery Packs (1.2 x 15)
Replies: 11
Views: 964

Re: 18 Volt Sub C NiCd Battery Packs (1.2 x 15)

[quote=sandpiper post_id=88249 time=1598507035 user_id=28505] Thanks Janitor Tzap and Externet. Years ago I used a battery rebuild service. The first time it was ok. The second time I received defective packs. If you have expensive lithium packs, I suppose it makes sense to use a battery rebuild ser...
by gerty
Tue Aug 04, 2020 2:09 am
Forum: General Discussion
Topic: looking for a timer
Replies: 13
Views: 1420

Re: looking for a timer

Strange !!! I haven't dealt with MPJA in years... Today I see this and get a sales flyer from them !! What are the odds..
by gerty
Mon Jul 20, 2020 1:45 am
Forum: General Discussion
Topic: The Eternal $19.00 Radio
Replies: 13
Views: 1519

Re: The Eternal $19.00 Radio

Back in the early 60's radios would advertise how many transistors were inside, like "6 transistor high fidelity".. Opened one up one day to see these wonder devices, it had the advertised quantity of transistors soldered to the board but a couple of them had no traces going to them !!
by gerty
Mon Jul 20, 2020 1:30 am
Forum: General Discussion
Topic: Linear power supply problems
Replies: 10
Views: 1113

Re: Linear power supply problems

I'd test the 3055's , you may have one or two of them failing to turn on. That would cause the others to flake out..
by gerty
Wed Apr 29, 2020 1:49 am
Forum: General Discussion
Topic: fading away
Replies: 25
Views: 8185

Re: fading away

You can pull the emergency release handle (for opening door when power is off). Running the motor back and forth without the door might help in your diagnosis ..
by gerty
Fri Apr 10, 2020 1:21 am
Forum: General Discussion
Topic: Help a Fellow Out
Replies: 12
Views: 4976

Re: Help a Fellow Out

You can buy one of these for $22. They're a cheap ham radio that can be programmed for the weather freqs. They also have a FM radio in them.. You would program it to receive only and could also be used as a scanner for local Police, Fire, EMS Providing they areUHF/VHF analog https://www.ebay.com/itm...
by gerty
Thu Mar 26, 2020 11:02 pm
Forum: General Discussion
Topic: Is Nuts and Volts dead ?
Replies: 64
Views: 20012

Re: Is Nuts and Volts dead ?

I got one about 2 weeks ago marked "2019-5"
by gerty
Thu Mar 26, 2020 1:25 am
Forum: General Discussion
Topic: Citizens band (CB) Radio: Who still uses it?
Replies: 8
Views: 3092

Re: Citizens band (CB) Radio: Who still uses it?

I'm a member of a county rescue squad, we use VHF (high band) we have the occasion to go up on the montain to get 4 wheelers and side by side that wreck. Most of them use CB's. They cannot contact our dispatch, but can call others to relay info for our help.. Because of my Electronics/Programming ba...
by gerty
Mon Mar 09, 2020 8:46 pm
Forum: General Discussion
Topic: laser level offset measurement
Replies: 8
Views: 3749

Re: laser level offset measurement

At least I'm not the only one that's lost... :-)
by gerty
Mon Mar 09, 2020 8:40 pm
Forum: General Discussion
Topic: fading away
Replies: 25
Views: 8185

Re: fading away

I have an hour and a half ride to Nashville to Randolph Electronics if I want something today. Otherwise it's mail order.. Randolph has a few satellite stores that really don't have much.. Dunno how they stay open.