Metalwork - Lathe and Mill topics

Re: [Amateur-repairs] piece of mystery test gear id

a pic of the insides.

--
M3VUV

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Re: [electronics101] Photo Bi_coloured LED test Final concept.jpg uploaded #photo-notice

Basically you have it right.
LEDs don't share very well and a 500 ohm resistor will probably get quite hot. You could get around this by running the LEDs in series so the power goes through the resistor then through one LED then the other (facing the opposite way). This would also save you four connection blocks. Test it before building.

One board would be fine but to make it easier and clearer to understand and work with if you cut your schematic in half vertically and swap the sides. This will mean the power lines would be down the centre and the outputs on the outside. Then there would be less crossover of tracks and wires.
So looking at the board it would be power in the middle, resistor network then outputs at each edge.

Tony
https://ozfreemo.com
https://adelaidemodelrailroaders.com

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Re: [Amateur-repairs] piece of mystery test gear id

Transistor tester? That's the best I can come up with from those pictures.

Re: [Amateur-repairs] piece of mystery test gear id

I cannot read all of the control markings, but, from what I can read and what I see, it looks like some sort of transistor tester. Could be for grading or sorting transistors?

It does look interesting.

73
Glenn
WB4UIV

On 5/7/2023 7:59 AM, Paul Larner M3VUV wrote:

Hi all,i got this bit of test gear today from a radio rally in lincs(dambusters rally) uk,it was just £2 so brought it,heres some pics,has anyone any idea what it is,it has no date or maker markings but has an xtal oven+ led readout etc,any idea what it is?,thanks m3vuv

--   -----------------------------------------------------------------------  Glenn Little                ARRL Technical Specialist   QCWA  LM 28417  Amateur Callsign:  WB4UIV            wb4uiv@arrl.net    AMSAT LM 2178  QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR  "It is not the class of license that the Amateur holds but the class  of the Amateur that holds the license"

[Amateur-repairs] piece of mystery test gear id

Hi all,i got this bit of test gear today from a radio rally in lincs(dambusters rally) uk,it was just £2 so brought it,heres some pics,has anyone any idea what it is,it has no date or maker markings but has an xtal oven+ led readout etc,any idea what it is?,thanks m3vuv

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Re: [electronics101] Photo Bi_coloured LED test Final concept.jpg uploaded #photo-notice

[Edited Message Follows]

Hi there,

Sorry I didn't reply sooner, but I have been tweaking the final concept. I have just added 3 more photos of my schematic. The "Final concept" schematic should be read in conjunction with the other 2 schematics attached in the photo album.

As I have 4 turnouts in conjunction with these schematics, I am intending to put the wiring for all 4 on one PC board. The final wiring is on the "Final concept" schematic. I would appreciate it if you think I would be better off doing 4 single PCBs instead of the one PCB, and if the wiring of all 4 is correct by adding just one 12V DC supply to all 4 circuits. There are 2 bi-coloured LEDs attached to each turnout, 1 bi-colour shows GREEN (default) the other should show RED, then when the original shows RED instead of GREEN, it's "mate" should show the opposite colour I I hope that all makes sense.

Re the brightness of the LEDs, as each resistor will be controlling 2 LEDs, for now that doesn't concern me to much.

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Re: [electronics101] Photo Bi_coloured LED test Final concept.jpg uploaded #photo-notice

Hi there,

Sorry I didn't reply sooner, but I have been tweaking the final concept. I have just added 3 more photos of my schematic. The "Final concept" schematic should be read in conjunction with the other 2 schematics attached in the photo album.

As I have 4 turnouts in conjunction with these schematics, I am intending to put the wiring for all 4 on one PC board. The final wiring is on the "Final concept" schematic. I would appreciate it if you think I would be better off doing 4 single PCBs instead of the one PCB, and if the wiring of all 4 is correct by adding just one 12V DC supply to all 4 circuits. There are 2 bi-coloured LEDs attached to each turnout, 1 bi-colour shows GREEN (default) the other should show RED, then when the original shows RED instead of GREEN, it's "mate" should show the opposite colour I I hope that all makes sense.

Re the brightness of the LEDs, as each resistor will be controlling 2 LEDs, for now that doesn't concern me to much.

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Sunday, 7 May 2023