31
Older Technology / Re: Some really old electrolytic capacitors
« Last post by Mr Eastwood on August 12, 2023, 10:53:30 AM »That transistor looks like it needs to be in a museum! 
News:
SMF - Just Installed!
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32
Older Technology / Some really old electrolytic capacitors
« Last post by SeanB on August 06, 2023, 01:31:45 PM »These capacitors were in a little battery charger I just picked up. Germanium transistors, all point to point wiring, and these very elderly electrolytic capacitors. Of the 4 in there, in 2 series strings, only one comes back as possibly being a capacitor, the rest of them either are coming up as very bad quality diodes, or as a diode with 5000uF junction capacitance.
But then, as these capacitors are celebrating their reaching retirement age, for the two 5000uF 12V ones, or are already on retirement, for the 5000uF 6V ones, I would say they are doing well, despite the rubber seals being pretty much only for show.
Pics of the unit when it is cleaned up a little, but the pass transistor is an OC30, dated to roughly 1952, and, looking at the construction, made by Mullard in the UK. PNP, with a whole 1A4 collector current, and a breakdown voltage of 32V.
Updated to add in the whole PSU, after replacing the 2 capacitors, and doing a minor change to remove the non glowing and loose power indicator neon lamp. replaced with a 1000uF 63V and a 100uF 35V respectively, as those are what was in the box of capacitors I have, and came out first. Power on, and it actually works, and regulates reasonably well as well. Think it will get some use as a battery charger, as it does have current limiting, fixed with a pair of 10R resistors in parallel, and is adjustable from almost 0V to 12V. Not bad for a close to 65 year old piece of equipment, though safety is definitely something extra, no strain relief in mains, thin wire used there (predating Chinesium wire by around 5 decades it seems), and no ground on the metal chassis.
But then, as these capacitors are celebrating their reaching retirement age, for the two 5000uF 12V ones, or are already on retirement, for the 5000uF 6V ones, I would say they are doing well, despite the rubber seals being pretty much only for show.
Pics of the unit when it is cleaned up a little, but the pass transistor is an OC30, dated to roughly 1952, and, looking at the construction, made by Mullard in the UK. PNP, with a whole 1A4 collector current, and a breakdown voltage of 32V.
Updated to add in the whole PSU, after replacing the 2 capacitors, and doing a minor change to remove the non glowing and loose power indicator neon lamp. replaced with a 1000uF 63V and a 100uF 35V respectively, as those are what was in the box of capacitors I have, and came out first. Power on, and it actually works, and regulates reasonably well as well. Think it will get some use as a battery charger, as it does have current limiting, fixed with a pair of 10R resistors in parallel, and is adjustable from almost 0V to 12V. Not bad for a close to 65 year old piece of equipment, though safety is definitely something extra, no strain relief in mains, thin wire used there (predating Chinesium wire by around 5 decades it seems), and no ground on the metal chassis.
33
YouTube Video Episodes / T4D #156 - DriveMo Fail, DeWalt Winner..and News
« Last post by SeanB on December 02, 2022, 02:12:59 PM » T4D #156 - DriveMo Fail, DeWalt Winner..and News
https://www.youtube.com/watch?v=kjODT9-qTR4
In this video:
I had a failure while using the DriveMo tire inflator that I wanted to share as I had just reviewed it.
I went out and purchased a DeWalt tire inflator as a comparison / alternative as I need something reliable to use on my truck tires (tyres)
Support me through Patreon or by using my Amazon Store:
Patreon: https://www.patreon.com/mjlorton
Amazon Store: http://astore.amazon.com/m0711-20
https://www.youtube.com/watch?v=kjODT9-qTR4
In this video:
I had a failure while using the DriveMo tire inflator that I wanted to share as I had just reviewed it.
I went out and purchased a DeWalt tire inflator as a comparison / alternative as I need something reliable to use on my truck tires (tyres)
Support me through Patreon or by using my Amazon Store:
Patreon: https://www.patreon.com/mjlorton
Amazon Store: http://astore.amazon.com/m0711-20
34
YouTube Video Episodes / DriveMo Max X Portable Tire Inflator Review
« Last post by SeanB on October 27, 2022, 01:35:52 AM »DriveMo Max X Portable Tire Inflator Review
https://www.youtube.com/watch?v=oasht0PFZhs
A review and comparison of the DriveMo Max X to the RYSEAB Tire / Tyre Inflator:
https://digitlands.co/products/drivemo-max-x-portable-tire-inflator-w-7-4-touch-screen
https://www.kickstarter.com/projects/1334293007/drivemo-max-x-12000mah-full-touch-screen-air-inflator
RYSEAB Tire Inflator:
https://www.amazon.com/gp/product/B09C6C6BR1/
Support me through Patreon or by using my Amazon Store:
Patreon: https://www.patreon.com/mjlorton
Amazon Store: http://astore.amazon.com/m0711-20
Or anything on Amazon:
https://www.amazon.com/?_encoding=UTF8&camp=212353&creative=380557&linkCode=sb1&tag=m0711-20
https://www.youtube.com/watch?v=oasht0PFZhs
A review and comparison of the DriveMo Max X to the RYSEAB Tire / Tyre Inflator:
https://digitlands.co/products/drivemo-max-x-portable-tire-inflator-w-7-4-touch-screen
https://www.kickstarter.com/projects/1334293007/drivemo-max-x-12000mah-full-touch-screen-air-inflator
RYSEAB Tire Inflator:
https://www.amazon.com/gp/product/B09C6C6BR1/
Support me through Patreon or by using my Amazon Store:
Patreon: https://www.patreon.com/mjlorton
Amazon Store: http://astore.amazon.com/m0711-20
Or anything on Amazon:
https://www.amazon.com/?_encoding=UTF8&camp=212353&creative=380557&linkCode=sb1&tag=m0711-20
35
General Discussion / Very odd lamp I just saw
« Last post by SeanB on October 02, 2022, 03:13:51 PM »Just pulled an odd lamp out. Still working, just been getting a little wet. Still was lighting up in the fixture, yet the lamp tubes themselves were full of water. Very odd to have a CFL lamp where the actual glass tube itself was full of water, but this lamp was still attempting to operate and emit light.
36
YouTube Video Episodes / T4D #155 High Accuracy Clock...and Rabbit Holes!
« Last post by SeanB on September 05, 2022, 12:33:02 PM »T4D #155 High Accuracy Clock...and Rabbit Holes!
https://www.youtube.com/watch?v=whA4HPJj9_U
In this video:
* A look at how my high accuracy clock is doing after another year of testing.
I set it up for another year and show how the Keysight 53220A frequency counter / timer has been very useful to collect data.
* Chit chat about my interest in water purification measurement and the rabbit holes it's led me down.
High Accuracy Clock Project Playlist:
https://www.youtube.com/playlist?list...
https://www.lubrizol.com/Thermal-Mana...
https://www.3m.com/3M/en_US/p/c/elect...
* Programming Electronics Academy *
https://www.programmingelectronics.com/mjlorton/?orid=12382
------------------------------------------------------------------------------------------------------
Support me through Patreon or by using my Amazon Store:
Patreon: https://www.patreon.com/mjlorton
Amazon Store: http://astore.amazon.com/m0711-20
https://www.youtube.com/watch?v=whA4HPJj9_U
In this video:
* A look at how my high accuracy clock is doing after another year of testing.
I set it up for another year and show how the Keysight 53220A frequency counter / timer has been very useful to collect data.
* Chit chat about my interest in water purification measurement and the rabbit holes it's led me down.
High Accuracy Clock Project Playlist:
https://www.youtube.com/playlist?list...
https://www.lubrizol.com/Thermal-Mana...
https://www.3m.com/3M/en_US/p/c/elect...
* Programming Electronics Academy *
https://www.programmingelectronics.com/mjlorton/?orid=12382
------------------------------------------------------------------------------------------------------
Support me through Patreon or by using my Amazon Store:
Patreon: https://www.patreon.com/mjlorton
Amazon Store: http://astore.amazon.com/m0711-20
37
Older Technology / An odd item for sure
« Last post by SeanB on June 30, 2022, 06:59:33 AM »Decided to see what is inside this bit of arcane test equipment. Test gear, but while it is electronic, the use is definitely biological, and it has only one use.
Hennesey meat grader, what is used to set the quality of the meat you buy. Push the probe into the meat, and this machine does some arcane work with sensing in the probe, probably involving detecting fat content and water, then makes a decision as to what grade will be applied to the meat. Thus there is a need to attach a printer, probably a serial one via the power cord, and print out the grade, A, B, C and the class 1, 2, 3 of the meat, that is then used to run a coloured ink roller down the side in a line, to show, even after it has been sliced up into smaller parts, the grade of the original.
Has a case you can remove for cleaning, and then an inner housing on the electronics, with the 68705 CPU, with 16k of memory, and the external program EPROMs as well, plus the interface to the rest of the unit. Bottom board with the analogue stuff, and probably using some form of ADC to communicate with the CPU, and the isolated serial interface to the printer. 555 timer there as well, probably doing reset.
Definitely something is wrong, either there is another board hidden in the front, which does power conditioning, as 3A is a little high for power draw, though it does have sensing, so it knows when the probe is pushed into the device under test, and the speed of this, so it likely does evaluations on all aspects, rating according to depth as it goes in.
Power up and it does sort of work, but without the other half, which I do not have it remains a curiosity, made likely 1999 from the date codes, and never being repaired in this time, though there are a few minor revisions on the board, where there are extra components added probably due to earlier ones having common failures.
Hennesey meat grader, what is used to set the quality of the meat you buy. Push the probe into the meat, and this machine does some arcane work with sensing in the probe, probably involving detecting fat content and water, then makes a decision as to what grade will be applied to the meat. Thus there is a need to attach a printer, probably a serial one via the power cord, and print out the grade, A, B, C and the class 1, 2, 3 of the meat, that is then used to run a coloured ink roller down the side in a line, to show, even after it has been sliced up into smaller parts, the grade of the original.
Has a case you can remove for cleaning, and then an inner housing on the electronics, with the 68705 CPU, with 16k of memory, and the external program EPROMs as well, plus the interface to the rest of the unit. Bottom board with the analogue stuff, and probably using some form of ADC to communicate with the CPU, and the isolated serial interface to the printer. 555 timer there as well, probably doing reset.
Definitely something is wrong, either there is another board hidden in the front, which does power conditioning, as 3A is a little high for power draw, though it does have sensing, so it knows when the probe is pushed into the device under test, and the speed of this, so it likely does evaluations on all aspects, rating according to depth as it goes in.
Power up and it does sort of work, but without the other half, which I do not have it remains a curiosity, made likely 1999 from the date codes, and never being repaired in this time, though there are a few minor revisions on the board, where there are extra components added probably due to earlier ones having common failures.
38
New proof of concept ideas, projects, inventions / -
« Last post by Boymnmob on June 29, 2022, 04:07:22 PM »Your display or theme is probably different from mine... on the white / light gray of mine the red shows up prettily but I have difficulty reading T PrimeŽs yellow posts. Alright, IŽll stick to black.
39
Tutorials, lessons and courses / -
« Last post by Boymnmob on June 29, 2022, 03:16:18 PM »I am having problems with posting this
How can I make the bigger? Is their a latex command for that? Either that or can someone show me how to use it with displaystyle
How can I make the bigger? Is their a latex command for that? Either that or can someone show me how to use it with displaystyle
40
Older Technology / -
« Last post by Boymnmob on June 25, 2022, 03:48:11 PM »I played champ 9394 english for 26 seasons on the Amiga and right at the end a message box came up with "congratulations" partially crashed out though, the game then crashed. Did the game on the Amiga have a maximum lifespan??