luvdunhill Posted August 29, 2024 Report Posted August 29, 2024 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
jamesmking Posted August 30, 2024 Report Posted August 30, 2024 (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, 2024 by jamesmking Quote
luvdunhill Posted August 30, 2024 Report Posted August 30, 2024 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
jamesmking Posted August 30, 2024 Report Posted August 30, 2024 (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, 2024 by jamesmking Quote
bbest Posted October 13, 2024 Report Posted October 13, 2024 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
jamesmking Posted October 13, 2024 Report Posted October 13, 2024 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
bbest Posted October 13, 2024 Report Posted October 13, 2024 (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, 2024 by bbest Quote
Pars Posted October 13, 2024 Report Posted October 13, 2024 Not sure where you are at, but Octopart shows this: https://octopart.com/search?q=FJPF2145¤cy=USD&specs=0 1 Quote
jamesmking Posted October 13, 2024 Report Posted October 13, 2024 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
Pars Posted October 13, 2024 Report Posted October 13, 2024 Looks like you have to buy 250 of them though... Quote
MLA Posted October 15, 2024 Report Posted October 15, 2024 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
bbest Posted March 16 Report Posted March 16 (edited) On 8/2/2023 at 10:36 AM, jokerman777 said: Wanted to buy some FQPF8N80C seems uk rs-online only let me enter UK address, is there a way to get them ship worldwide? Hello all! Same question - how to replace it or where to buy? May be something from this: * FQP8N80C * STP8NK80Z * STP7NK80Z ? Edited March 16 by bbest Quote
jokerman777 Posted March 16 Report Posted March 16 9 hours ago, bbest said: Hello all! Same question - how to replace it or where to buy? May be something from this: * FQP8N80C * STP8NK80Z * STP7NK80Z ? I ended up using STP8NK80Z(FP) in place of those FQP ones and they work all good if that's what you asking? Should be available from major vendors still. 1 1 Quote
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