My dillema now is, [B]since the TL072CN is obsolete, what do I replace it with? [/B]In further research I have found that people speak highly of the TL072ACP, but there are a few different values that concern me, particularly output current...
clearchris
Badcaps Veteran
Last Activity: 07-22-2024, 05:24 PM
Joined: 12-29-2013
Location: San Antonio
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Yeah, I replaced all of them with higher voltage rated caps, turns out one of the TL072CN opamps is gone, or at least that's what I suspect. The pots feel buttery smooth, and the distortion doesn't sound pot induced. I added DIP sockets yesterday, haven't gotten a chance to swap some opamps to different sockets and test to confirm my suspicion.
My dillema now is, [B]since the TL072CN is obsolete, what do I replace it with? [/B]In further research I have found that people speak highly of the TL072ACP, but there are a few different values that concern me, particularly output current... -
In case anyone wants to do a recap, here's a listing of the caps in my Peavey PV23XO Crossover. My stock didn't quite cover me, I had to put an order in, so I don't have results yet.
[CODE]6x 10uf 50v
10x 22uf 25v
2x 47uf 25v
2x 100uf 16v
2x 470uf 35vā[/CODE]Code:In case anyone wants to do a recap, here's a listing of the caps in my Peavey PV23XO Crossover. My stock didn't quite cover me, I had to put an order in, so I don't have results yet. [CODE]6x 10uf 50v 10x 22uf 25v 2x 47uf 25v 2x 100uf 16v 2x 470uf 35
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Are you allowed to use the real solder up north? I thought you guys outlawed it like in the EU.
But yeah, a pound of good solder doesn't cost much from digikey and will last you a long time and will be a joy to use. I do have a spool of chinese solder, I use it mostly for adding Pb to non PB joints that need desoldering. Using the chinese solder to solder with is just frustrating....Leave a comment:
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It's actually the youngest, cleanest piece of equipment in my rack aside from the raspberry pi. š Non smoking house, and the box is pretty well sealed. Kind of surprised it needs a repair already.
Everything looks hand soldered, so you have a good point about checking solder joints. I hadn't expected this to be a hand soldered, through hole board, but it is (and that's a good thing imho). I'll see what's under there after I take out the 30 screws...
Thank you!...Leave a comment:
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Just always keep some solder on the tip when you turn off the iron. If you buy real (hakko, etc) tips, and have an iron with an auto shutoff (so it's not left on for days) it takes a long time to wear one down.
But yeah, I have some "tip refresher" from a different brand, it does nothing worthwhile.Leave a comment:
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I'll be the first to admit that I never really used solder wick unless I had to. Some years ago, I bought a desolder station (almost 300usd), and it has been great.
Lately, there are some very cheap soldering iron/desolder pump combos that seem to work ok. They had something similar to this at my former work and they seemed to like it.
[url]https://www.aliexpress.us/item/3256804929123151.html[/url]https://I'll be the first to admit t...n great.<br />Leave a comment:
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You can also get dedicated boards to do frequency counting, they are very cheap. Check aliexpress....Leave a comment:
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Peavey PV23XO Crossover Repair and Enhancement
This crossover was bought new about 12 years ago, and has probably been powered on for at least 3/4 of that time. It also has a recently developed horrible sound on the second channel, sometimes it's a wub-wub-wub, sometimes it's just a hum that comes and goes. It's not noticable if something is playing (it may be gone), but it's quite noticable if there is silence.
Because of age and problems it's due for a recap. I'm also strongly considering putting in sockets to potentially replace the 12 ST TL072 opamps. For such a small device, it's still going to be over 30 screws to take... -
Re: Electrolytic SMD removal tools
Looks like it could stand some adjusting with a hammer, punch and file. Sounds like iron plating isn't too bad to do if you really wanted to be obsessive. Are the tips replacable?
These diy solder tips are pretty smart. I had just learned about doing these on the big weller soldering guns, I have a few of these screw down irons that I haven't used in years, could come in handy....Last edited by clearchris; 10-14-2023, 11:43 AM.Leave a comment:
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Re: Old Weller 100/140 Watt Soldering Gun
I can't say if that bulb was stock, these irons have truly unknown provenance, they could have come out of a trash can.
I took a closer look at my other one, and wow. No bulb, looks like the top had been broken off at some point, and somone spilled black epoxy all over the top to keep it together. If I disassemble one to make a permanent handleless bench top iron, it's going to be that one.
Before I do anything rash, has anyone ever needed to dual wield two soldering guns? 140w seems like it...Leave a comment:
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Re: Old Weller 100/140 Watt Soldering Gun
Printed a stand with a trigger hold down bar. The stand seems firm, Ithink the trigger hold down bar could use some tuning, both for functionality and also for printability.
(not my design, btw)
[url]https://www.thingiverse.com/thing:3812661[/url]
[attach]313617[/attach]Re: Old Weller 100/140 Watt Solderin.../> <br /> (not...Last edited by clearchris; 10-07-2023, 11:08 AM.Leave a comment:
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Re: Old Weller 100/140 Watt Soldering Gun
All the cool kids on youtube seem to use 8-14ga solid copper wire as a tip. Would probably be super easy to make a tip bending jig out of some nails and a piece of wood....Leave a comment:
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Re: Old Weller 100/140 Watt Soldering Gun
Wow, I thought he had one video on how he used a solder gun for smt, but it's just what he uses. Then I see him freehand dremel a solid pcb into a full circuit. I feel like I'm in an F1 race and I just got lapped by a guy on a unicycle.
Truly you can do a lot with basic tools if you have real skill....Leave a comment:
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Old Weller 100/140 Watt Soldering Gun
Someone gave me two of these 100/140w weller soldering guns. Yes, I know it runs current right through the tip, but might be nice to really get some heat into some big wires that need to be soldered.
So, worth a place on the bench, or chuck it?
[ATTACH]313320[/ATTACH]... -
Re: Chinese hot air and soldering stations
If you are going cheap, get the cheaper hot air, spend more on an iron. I don't see a lot of savings from getting the all-in-one units, I'd prefer separate machines.
If you are just starting out, the pinecil is pretty good if you can find an old 20v laptop charger that you can cut apart. For hot air stations, a lot of people use the cheap ones, but I think skill matters a lot more than the hot air tool (at least in my unskilled hands).Leave a comment:
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Auto Lead Acid Battery Charger
Hi!
I have a super basic schumacher 120v to 6/12v 2/5a auto battery charger. It's a metal box with a meter, switch that goes to the taps on the transformer, a rectifier attached to a sink and a thermal cutout switch. No electronics PCBs, or other circuitry.
When I attach the clamps to the battery, it charges properly for maybe 30 seconds, then I hear what I believe is the thermal fuse tripping, and it goes off. In a minute or so, it turns back on and the cycle repeats. This happens on 2a mode and 5a mode.
With no battery attached, I measure 14v DC at... -
Re: Shorty short finder branched and released as ShortyPen!
My convection toaster oven does have a fan in it, the temperature is very stable, can easily hold 1c, and I bet part of that is electrical noise on my ancient max type-k reader chip. I wouldn't bother if the toaster oven doesn't have a fan.
From the way I understand air fryers, they move a lot of air out, so I don't know that they could reach the target temperatures quickly enough. However, I haven't really looked into it. If they are all quartz heaters or other heater with fast response it might be possible....Leave a comment:
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Re: Shorty short finder branched and released as ShortyPen!
If you purchase the stm32 chips from a reputable place, it will come with a moisture indicating paper, and it will tell you if you need to pre-heat (if you follow their processes exactly). I'd probably do it anyway.
Yeah, the oven was state of the art a few years ago, but since then, I have heard from others who have made their own KlipperOvens. Yeah, detractors will say that it's a lot of hardware for an oven, you could get by with only an MCU, but IMHO, it's worth it for the feature set,...Leave a comment:
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Re: Shorty short finder branched and released as ShortyPen!
It's not the accuracy that was the issue, I think the issue is overheating / destroying the chip. The chips absorb moisture, and that moisture tends to expand and destroy the chip during heating.
I haven't tried reflowing an stm32 in the reflow oven, but I do have a few chips in my dessicant pail. And yes, love my reflow oven, but I rarely do reflow in it.
I have a thread on here about my oven, I also put a lot up on hackaday.
[url]https://hackaday.io/project/171619-not-just-a-reflow-oven[/url]...Last edited by clearchris; 01-27-2023, 12:02 PM.Leave a comment:
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Re: Shorty short finder branched and released as ShortyPen!
These boards are super small, wouldn't they fall under small-packet postage? It's not quick, but it's pretty cheap. But yeah, cheaper in quantity for sure.
itstallion: Have you had success soldering stm32 chips? If you have, do you have any tricks? I have not been successful.Leave a comment:
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