luvdunhill Posted August 29 Report Share Posted August 29 1 minute ago, swt61 said: I seem to remember some guy laughing at me trying to read resistors when I built Colin's amp. 🙂 Now I have one bionic eye, and can read them fine. 😂 Quote Link to comment Share on other sites More sharing options...
jamesmking Posted August 30 Report Share Posted August 30 (edited) 8 hours ago, luvdunhill said: Can anyone recommend a nice portable HD microscope to go with my new far-sightedness for soldering? I purchased a cheap rebranded scope from amazon one a few years back for smd and pcb inspection It looks identical to this one: https://amscope.com/collections/student-microscopes-low-power-stereo/products/se420xyz-2l it works. My only complaints are 1. it does not have a zoom 2. its not trinocular so you can't add a camera look through it at the same time 3. there is no real X and Y adjustment. instead it pivots around which makes moving around a pcb a bit of a pain. 4. because the objective lenses are housed in a rectangular box you cant fit a ring light easily. 5. the objective lenses are not a "standard" mount and that limits you options for different lenses Edited August 30 by jamesmking Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted August 30 Report Share Posted August 30 14 hours ago, jamesmking said: I purchased a cheap rebranded scope from amazon one a few years back for smd and pcb inspection It looks identical to this one: https://amscope.com/collections/student-microscopes-low-power-stereo/products/se420xyz-2l it works. My only complaints are 1. it does not have a zoom 2. its not trinocular so you can't add a camera look through it at the same time 3. there is no real X and Y adjustment. instead it pivots around which makes moving around a pcb a bit of a pain. 4. because the objective lenses are housed in a rectangular box you cant fit a ring light easily. 5. the objective lenses are not a "standard" mount and that limits you options for different lenses Do you use it for inspection or for assembly? Quote Link to comment Share on other sites More sharing options...
jamesmking Posted August 30 Report Share Posted August 30 (edited) 1 hour ago, luvdunhill said: Do you use it for inspection or for assembly? bit of both. working distance is ok for either a hot air handle or a soldering iron. It takes some getting used to since you have a fixed defined viewing circle, you can't move your head and have to organise everything around that. I personally found that exact head positioning was very critical to get a good 3d perspective view and this meant I wanted to minimise the number of times I looked up away from the microscope. Edited August 30 by jamesmking Quote Link to comment Share on other sites More sharing options...
bbest Posted October 13 Report Share Posted October 13 Hello all! Now FJPF2145 obsolete on Mouser. But I need to finish my T2. Where it is possible to get or how to replace them? What you think? Quote Link to comment Share on other sites More sharing options...
jamesmking Posted October 13 Report Share Posted October 13 3 hours ago, bbest said: Hello all! Now FJPF2145 obsolete on Mouser. But I need to finish my T2. Where it is possible to get or how to replace them? What you think? FJPF5027OTU seems to be a possibility, seems to have similar specs except lower current rating and the same pinout. Hfe of FJPF2145 is 20 - 40 which is the same as the O variant of the 5027 1 Quote Link to comment Share on other sites More sharing options...
bbest Posted October 13 Report Share Posted October 13 (edited) 2 hours ago, jamesmking said: FJPF5027OTU seems to be a possibility, seems to have similar specs except lower current rating and the same pinout. Hfe of FJPF2145 is 20 - 40 which is the same as the O variant of the 5027 all good, but output capasitance 60pF vs 11pF. Edited October 13 by bbest Quote Link to comment Share on other sites More sharing options...
Pars Posted October 13 Report Share Posted October 13 Not sure where you are at, but Octopart shows this: https://octopart.com/search?q=FJPF2145¤cy=USD&specs=0 1 Quote Link to comment Share on other sites More sharing options...
jamesmking Posted October 13 Report Share Posted October 13 2 hours ago, bbest said: all good, but output capasitance 60pF vs 11pF. farnell in the uk has plenty of stock of the FJPF2145 https://uk.farnell.com/onsemi/fjpf2145tu/trans-npn-800v-5a-125deg-c-40w/dp/3368628 Quote Link to comment Share on other sites More sharing options...
Pars Posted October 13 Report Share Posted October 13 Looks like you have to buy 250 of them though... Quote Link to comment Share on other sites More sharing options...
MLA Posted October 15 Report Share Posted October 15 On 10/13/2024 at 4:06 PM, bbest said: On 10/13/2024 at 1:44 PM, jamesmking said: all good, but output capasitance 60pF vs 11pF Noted that and am wondering for this application; how much does it matter when used as a current source? I don't know enough of the theory to figure that one out. Help... ? Quote Link to comment Share on other sites More sharing options...
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