Post AhnFDX6GyVBWcR81BY by james@social.ncot.uk
 (DIR) More posts by james@social.ncot.uk
 (DIR) Post #AhnCXuTxS1TF4AEQuO by foone@digipres.club
       2024-05-11T20:21:20Z
       
       0 likes, 0 repeats
       
       this electrical device is a special sort of terrible: They labeled the polarity of the DC power jack, but not the voltage (or current, for that matter)
       
 (DIR) Post #AhnCXxT0M1UUK4oDL6 by foone@digipres.club
       2024-05-11T20:21:41Z
       
       0 likes, 0 repeats
       
       gonna assume that just means I can throw whatever I want at it.97v 19amp, here I come!
       
 (DIR) Post #AhnDaFG3HJXc2BP9Xs by foone@digipres.club
       2024-05-11T20:25:26Z
       
       0 likes, 0 repeats
       
       I shouldn't have to disassemble your device and find the voltage regulator and read the datasheets to know how many volts to give you!
       
 (DIR) Post #AhnDaIK3srWzXUItiC by foone@digipres.club
       2024-05-11T20:27:30Z
       
       0 likes, 0 repeats
       
       It's an L7805: so the max voltage is 35v, recommended voltage is about 10v?
       
 (DIR) Post #AhnEEOfHire4nDLww4 by rotopenguin@mastodon.social
       2024-05-11T20:30:49Z
       
       0 likes, 0 repeats
       
       @foone curl a penny to the barrel diameter, shove it in and clamp your ground electrode to it. Poke the thoriated tungsten probe in center. Turn off the gas, you won't be needing it.Boom, instant TIG PSU.
       
 (DIR) Post #AhnEMsq7Pwqqh8T1qi by philpem@digipres.club
       2024-05-11T20:33:02Z
       
       0 likes, 0 repeats
       
       @foone 9 to 12 depending on heatsinking, aye. Works down to seven and a half.
       
 (DIR) Post #AhnEcDfMGeJNd9kMbo by anotherwalther@mastodon.social
       2024-05-11T20:38:53Z
       
       0 likes, 0 repeats
       
       @foone https://cohost.org/tercel-enby/post/3926360-empty
       
 (DIR) Post #AhnEluJr3NDMWVJB20 by ChuckMcManis@chaos.social
       2024-05-11T20:39:33Z
       
       0 likes, 0 repeats
       
       @foone L7805 or LM7805? As a linear regulator the amount of heat it will dissipate will (input_voltage - 5) * current. So if you give it 10V and draw one amp from it the case will be dissipating 5W of heat. (quite toasty and will melt a TO-220 without heatsink) Typical safe dissipation in still air is about 2W so 7A in and 1A draw before you need to add copper.
       
 (DIR) Post #AhnEvXPr3tk0Nzhtlg by rotopenguin@mastodon.social
       2024-05-11T20:40:26Z
       
       0 likes, 0 repeats
       
       @foone *turning the knob on my bench supply, looking at the audience like a contestant on The Price Is Right*
       
 (DIR) Post #AhnFDX6GyVBWcR81BY by james@social.ncot.uk
       2024-05-11T20:47:41Z
       
       0 likes, 0 repeats
       
       @foone I shouldn't have to disassemble your device and repair your poor soldering to make it work out the box, either.I remember when Amazon sold products, and wasn't just a front for the same Chinese sellers who infest eBay and Aliexpress.
       
 (DIR) Post #AhngArEyKoWSyc985I by bytex64@awesome.garden
       2024-05-12T01:55:38Z
       
       0 likes, 0 repeats
       
       @foone Surely you will not regret 97v 19amp.
       
 (DIR) Post #Ahnuzs5WLFt3jSwdWK by gooba42@mastodon.social
       2024-05-12T04:41:17Z
       
       0 likes, 0 repeats
       
       @foone Plug that sucker into a variable power supply and turn the knobs until it either works or explodes!