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Search: Posts Made By: eccerr0r
Forum: General Electronics Technical Discussion Today, 08:37 PM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

Actually, the wall wart looks like a SMPS with a very high impedance as far as I know. At least the pictures that I've seen, the wall wart is tiny, much like a modern phone charger... That being...
Forum: General Electronics Technical Discussion Today, 12:45 PM
Replies: 18
Views: 262
Posted By eccerr0r
Re: Air Supply Systems

I don't know why you're obsessed with using a refrigerant pump, perhaps it's all those youtube videos. Anyway the reason why it's not suggested is that these pumps is that they are closed systems,...
Forum: General Electronics Technical Discussion Yesterday, 05:14 PM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

Well, the charger does properly cut off when charging at 0.1C ... battery is full and never gets warm during charge.

Now I never checked temperatures during discharge, now that's a different...
Forum: General Electronics Technical Discussion Yesterday, 04:30 PM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

The question is why was my vacuum designed with such a slow charge? Does it benefit the battery to have a slow charge after a fast discharge when it's being used. Current setup is like 0.1C charge,...
Forum: General Electronics Technical Discussion Yesterday, 10:00 AM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

I should make my vacuum USB charged, screw these special wall warts :D
Forum: General Electronics Technical Discussion 03-23-2019, 06:46 PM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

Well, looks like that circuit board is indeed a charge protection board and will cut off power when the battery is fully charged.

The weird thing is that the original wall wart for the li-ion cell...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-23-2019, 05:40 PM
Replies: 9
Views: 113
Posted By eccerr0r
Re: Mean Well PT-65-R13VAI with a short.

Is the PSU actually shorted now, tried just replacing the fuse and seeing if there's life? Use a DBT instead of the fuse?

The fuse did what it it was meant to do, maybe you got lucky and there's...
Forum: General Electronics Technical Discussion 03-23-2019, 12:17 AM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

The thing I wonder is if I can use the old charger... after all, what is this circuit board for if it doesn't appear to have overdischarge cutoff (since it appears to hook the + and - directly to the...
Forum: General Electronics Technical Discussion 03-22-2019, 03:43 PM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

It's an old Hoover, and yes 10A...though only at 3.6V = 36 watts.
Only good for small spills but sometimes that's what you need. Anything bigger I need to use the shop vac.
Forum: General Electronics Technical Discussion 03-22-2019, 02:24 PM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

Well, not exactly. I transplanted the power system from a seemingly working vacuum that theoretically was designed properly to the old one.

I wanted the wet/dry system of the older vacuum, hence...
Forum: General Electronics Technical Discussion 03-22-2019, 01:07 PM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

Eh no... I'm saving my _old_ vacuum cleaner that came with NiCd cells...
Now my _old_ vacuum has a single Li-ion cell and it sucks once again!
Forum: General Electronics Technical Discussion 03-22-2019, 10:02 AM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

We'll see how long it lasts and if it goes up in smoke. I don't know what protection this thing really has.

7.5 minutes is ⅛ hour, which is an immense load. 1.5Ah / ⅛h = 12A (in the "new"...
Forum: General Electronics Technical Discussion 03-22-2019, 04:12 AM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

The battery appears to be wrapped and no real good markings visible on it. I suspect it should be just as good as both vacuums have similar runtimes (~7.5 minutes) and initial battery capacities...
Forum: General Electronics Technical Discussion 03-21-2019, 07:47 PM
Replies: 127
Views: 1,258
Posted By eccerr0r
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

Well, I picked up another junk handheld vacuum cleaner for a buck. I grabbed it because it seems to still be spinning, and said "lithium 3.6V" ... Jackpot, it might actually match the specifications...
Forum: Troubleshooting TVs and Video Sources 03-21-2019, 09:08 AM
Replies: 6
Views: 122
Posted By eccerr0r
Re: CRT TV:What causes this kind of geometry issue?

There are a lot of strange controls needed to control a flat screen short neck CRT versus a traditional long neck curved screen.

/_/ and \_\ parallelogram control
/_\ and \_/ trapezoid control...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-21-2019, 09:00 AM
Replies: 27
Views: 208
Posted By eccerr0r
Re: Voltage Regulators and Heat Issues

Yes, all switch mode power supplies use some sort of PWM to regulate.
Forum: Troubleshooting TVs and Video Sources 03-20-2019, 10:06 PM
Replies: 6
Views: 122
Posted By eccerr0r
Re: CRT TV:What causes this kind of geometry issue?

:lolsign:

Well with flat CRT screens a lot of magic is needed to make sure that things are lined up. A lot of the times a microcontroller has a setting to control parallelogram alignment and a...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-20-2019, 07:17 PM
Replies: 27
Views: 208
Posted By eccerr0r
Re: Voltage Regulators and Heat Issues

It's surprising how loud these piezo buzzers can get... The flaky one I have is only a about 1cm in diameter.

I have another piezo buzzer from an expired CO alarm with a 4cm piezo element. This...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-20-2019, 03:46 PM
Replies: 27
Views: 208
Posted By eccerr0r
Re: Voltage Regulators and Heat Issues

That changes things now does it...

I was playing with one of my piezo buzzers with built in oscillator and it was quite flaky, probably because it's cracked. But it was modulating kind of funny...
Forum: Troubleshooting Game Consoles & Other Weird Devices 03-20-2019, 01:43 PM
Replies: 32
Views: 2,611
Posted By eccerr0r
Re: Post your worthless and/or pointless repairs

Nice grats... I was wondering who uses pencils anymore (does anyone handwrite anymore?)... :o:

I have a problematic shaded pole motor like the one you have, and I suspect that the rotor's "rungs"...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-20-2019, 01:26 PM
Replies: 27
Views: 208
Posted By eccerr0r
Re: Voltage Regulators and Heat Issues

Are you sure they are transducers or are they buzzers? Will they beep with just DC connected to them? Now I'm confused again...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-20-2019, 12:23 PM
Replies: 27
Views: 208
Posted By eccerr0r
Re: Voltage Regulators and Heat Issues

The inductor is the same principle as a boost switch mode power supply, except we don't care about which way the current goes (so the diode isn't needed except perhaps to protect the transistor), AC...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-20-2019, 11:45 AM
Replies: 27
Views: 208
Posted By eccerr0r
Re: Voltage Regulators and Heat Issues

If you're concerned about power loss as heat, yes you need a switching regulator which is designed for efficiency. The modules with inductors preassembled suggested by redwire and R_J above are your...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-20-2019, 08:54 AM
Replies: 27
Views: 208
Posted By eccerr0r
Re: Voltage Regulators and Heat Issues

Add other dissipation devices before the 7805 (resistors, preregulators). You could use a 7818, then a 7812, then the 7805, and the heat is distributed among the three.

Else use a switching...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-20-2019, 01:44 AM
Replies: 25
Views: 376
Posted By eccerr0r
Re: Apple ][+ Astec power supply

Too many burst RIFAs. Why haven't I seen any dead WIMAs...

Incidentally the BUW44 probably could work as a replacement for the PSU, it should switch at 200KHz, sustains 400V, 6A... This 200KHz is...
Showing results 1 to 25 of 500

 
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