Cheezeball DC Load: DL24P: Pump, or Dump ???

[mnementh]

Resistors are 0603's as I measured (6332 or 2512 are huge) them so more likely 1/8W or 'maybe' 1/4 but if you can save $0.0001 then ......

Stage one because I have the microscope out for my old eyes and the LCR Research Tweezers fired up in anger. Peripheral components and values as tested now onto the nitty gritty itty bitty ones.

They are huge. I didn't guess, man; I measured the things.  With a micrometer. Also, I have considerable experience with these very components on ESCs. They are 6332s, and pretty much exactly what I've seen on dozens of ESCs and PDBs in the 20-30A range. Only difference is some of them are even lower resistance or double-stacked. Also, they make a thick-film version especially for shunts which is like twice the normal wattage; I've worked on ESC design with a few of those guys.

mnem
 

[beanflying]

Ok so Codeine issues don't operate heavy machinery of try and do electronics while taking  yep 6332's 

Itty Bitty pics as a placeholder. I will update when I get values stuck on.

[mnementh]

Bwahahahaha!

No prob dude. You had me going there tho... thought maybe you had some teeny tiny little bastard-child shunt resistors, scaled Asian-sized the same way some Asian-sized clothes are; where 4XL is like a 32 waist. 

mnem
 

[fubgumfaw]

Resistors are 0603's as I measured (6332 or 2512 are huge) them so more likely 1/8W or 'maybe' 1/4 but if you can save $0.0001 then Codeine ......

Stage one because I have the microscope out for my old eyes and the LCR Research Tweezers fired up in anger. Peripheral components and values as tested now onto the nitty gritty itty bitty ones.

I'm pretty sure that part next to the mosfet you have labeled as "320" is a thermistor.

[beanflying]

Yep just hit it with the heat gun PTC thermistor circa 320 at 25C increasing with heat.

Tweaked the earlier image with PTC on it.

[Hamelec]

Yep just hit it with the heat gun PTC thermistor circa 320 at 25C increasing with heat.

Tweaked the earlier image with PTC on it.

Sure? at the old board of DL24 (2-wire-Version) there are 2 NTC 10k, one for the speed of the fan, the other one for the temperature of the MOSFET.
(i rised it up for a closer thermal contact to the heatsink)

[beanflying]

Interesting just checked my original one and got a 5k NTC at the rear and a PTC 340  at the front so  different versions maybe over time.

[Hamelec]

this Model isnt a DL24, thats the former one with analog control (Potentiometer).

[beanflying]

Yep. So yours is the early version of the DL24 and different again  Interesting the changes anyway.

[mnementh]

Good to see you shifting priorities to what's important, bean.

I don't feel the thing is worth the hassle of designing a case until after we get it sorted to such point as actually being useful. Fukkin' thing doesn't deserve any clothes until it's ready to go to work. 

mnem

[mawyatt]

There's something addictive about getting these cheap POS things squared in proper working order so you can actually use them. 

I've been bit so many times and spent so much $ and time, don't want to remember

Good luck and I'm hoping I don't get bit again

Best,

[fubgumfaw]

I've looked at digital tweezers many times just for this sort of thing...wish I had a pair!

[beanflying]

I've looked at digital tweezers many times just for this sort of thing...wish I had a pair!

I was weighing up buying the LCR or Smart Tweezers a few years ago and pulled the trigger on the LCR ones. Same week a secondhand ST5 turned up with a poor description and me being the only bidder so I brought them too ($120 USD from memory)

The irony of using $500 worth of toys on a sub $50 PCB is well 

Back to it soon but first COFFEE.

[fubgumfaw]

The irony of using $500 worth of toys on a sub $50 PCB is well 

LOL...are you having fun with your expensive toys or still wishing you had them?

I'm wanting LCR tweezers really. I nearly pulled the trigger on the DT71 a while back, but looked at several reviews and backed away. I have a Hantek LCR meter. I might as well get tweezers leads for it so I can do SMD checking.

[beanflying]

The ability to do in circuit testing is the big win over other LCR options. The Hong Kong option in the works looks interesting if it gets off the ground. I really should sell one of my pairs off as I don't need two but still haven't settled on which is the better of them.

Fail today my back won't cope with sitting at the bench.

[tautech]

The ability to do in circuit testing is the big win over other LCR options. The Hong Kong option in the works looks interesting if it gets off the ground. I really should sell one of my pairs off as I don't need two but still haven't settled on which is the better of them.

Fail today my back won't cope with sitting at the bench.

Raises hand for $120 ST5 if you'll part with it....if it's the S model. 

[fubgumfaw]

The ability to do in circuit testing is the big win over other LCR options. The Hong Kong option in the works looks interesting if it gets off the ground. I really should sell one of my pairs off as I don't need two but still haven't settled on which is the better of them.

Fail today my back won't cope with sitting at the bench.

Raises hand for $120 ST5 if you'll part with it....if it's the S model. 

There's 2 of these for sale on ebay.
https://www.ebay.com/itm/Smart-Tweezers-Colibri-LCR-ESR-Multimeter-Capacitor-Tester-Simplified-Economical/322191163501?hash=item4b0417006d:g:KvAAAOSwYSlXhnqS

[tautech]

The ability to do in circuit testing is the big win over other LCR options. The Hong Kong option in the works looks interesting if it gets off the ground. I really should sell one of my pairs off as I don't need two but still haven't settled on which is the better of them.

Fail today my back won't cope with sitting at the bench.

Raises hand for $120 ST5 if you'll part with it....if it's the S model. 

There's 2 of these for sale on ebay.
https://www.ebay.com/itm/Smart-Tweezers-Colibri-LCR-ESR-Multimeter-Capacitor-Tester-Simplified-Economical/322191163501?hash=item4b0417006d:g:KvAAAOSwYSlXhnqS

Colibri = no diode test. 

[fubgumfaw]

There's 2 of these for sale on ebay.
https://www.ebay.com/itm/Smart-Tweezers-Colibri-LCR-ESR-Multimeter-Capacitor-Tester-Simplified-Economical/322191163501?hash=item4b0417006d:g:KvAAAOSwYSlXhnqS

Colibri = no diode test. 

I know...thought maybe that could be lived with. I have a Hantek LCR meter. It doesn't do diodes either and I'm OK with that most of the time. It was on the "nice to have" list of features. I cared more about LCR and auto detect and it does all of that. There have been times when I would have liked to know if something was a zener or just a diode. I need to get some better SMD tweezers for it. These ought to do fine.

https://www.ebay.com/itm/BK-Precision-TL885A-TWEEZER-SMD-TEST-PROBE/333511217660

 It's far from perfect, but I have a Chinese component tester and I use that 2 wire lots of times to check stuff on boards. This has it's own issues a lot like the DT71 does and accuracy of values is average. Better than nothing and cost $30. One of it's issues is it doesn't handle zeners above about 6v. It just sees them as diodes. Sometimes it gets parts completely wrong when they are in circuit.

[tautech]

There's 2 of these for sale on ebay.
https://www.ebay.com/itm/Smart-Tweezers-Colibri-LCR-ESR-Multimeter-Capacitor-Tester-Simplified-Economical/322191163501?hash=item4b0417006d:g:KvAAAOSwYSlXhnqS

Colibri = no diode test. 

I know...thought maybe that could be lived with. I have a Hantek LCR meter. It doesn't do diodes either and I'm OK with that most of the time. It was on the "nice to have" list of features. I cared more about LCR and auto detect and it does all of that. There have been times when I would have liked to know if something was a zener or just a diode. I need to get some better SMD tweezers for it. These ought to do fine.

https://www.ebay.com/itm/BK-Precision-TL885A-TWEEZER-SMD-TEST-PROBE/333511217660

 It's far from perfect, but I have a Chinese component tester and I use that 2 wire lots of times to check stuff on boards. This has it's own issues a lot like the DT71 does and accuracy of values is average. Better than nothing and cost $30. One of it's issues is it doesn't handle zeners above about 6v. It just sees them as diodes. Sometimes it gets parts completely wrong when they are in circuit.

Getting wildly off topic but my 15 yr old ST3 tweezers have diode test mode and I wouldn't do without it.

[mnementh]

MASTECH MS8911 is a great bang/buck option; very good, very quick, low-voltage mode is PCB diag friendly.

https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg3114618/#msg3114618

mnem
 

[fubgumfaw]

MASTECH MS8911 is a great bang/buck option; very good, very quick, low-voltage mode is PCB diag friendly.

https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg3114618/#msg3114618

mnem
 

And you think the MS8911 are worth it? Everything in this price range is pretty awful. Even at double the price, options are not great. I think the "good ones" are expensive because they have no competition. Cost of manufacturing isn't why they cost a lot. It's 100% due to lack of lower cost competing products that work as well that keep all the Canadian tweezers so high priced!

Getting wildly off topic but my 15 yr old ST3 tweezers have diode test mode and I wouldn't do without it.

Yeah...agreed...probably my fault too.

[mnementh]

Categorically yes. The MS8911 are a bargain at ~$50 delivered.

I've used all of the tweezers in question. I own the MS8910 & MS8911. The MS8910 is a waste of money, even at ~$20-25. The MS8911 delivers on everything the MS8910 promises, but fails miserably, and it delivers a solid 90% of what the ST-5S delivers as well, at ~1/10 the price.

In comparison, the major shortfalls are lack of upgradable FW and it uses a CR2450 instead of the cheapest possible LiPo cell. IMO, the latter is a wash; each source of power has its own pros & cons. In practice, I have yet to see any need to upgrade the FW in the MS8911; it just works.

But if you read my review of the MS8911, you'd already know this.

mnem
"...we now return you to your regularly-scheduled madness, already in progress."

[Hamelec]

but so far as i can see (in the "manual") it is missing a diode/zenerdiode test function?
.. and it looks like that it is only available from Ebay China /Ali ?

[mnementh]

ST-5 doesn't either. Think aboot the device; omitting that function means no need for boost converter and everything works happily on 3.7V or less, and battery life is much improved without the high drain of that converter. Simpler, more reliable device. I can see why Colibri, etc went that way with the ST-5, and why they did the same with the MS8911.

mnem