Magnifying light voltages

[bushtech]

Heh Thats me and you

 

[bushtech]

Is the one you are checking there a working one so I can shoot for those readings?

 

[Martaine2005]

Yes, it is now!!. It had terrible solder joints and the neutral popped off when I removed the PCB.
I have two, both working. I’ll check them both.

Martin

 

[bertus]

Hello,

@bushtech , I have used the code tags to preserve the spaces in your table.

Bertus

 

[bushtech]

Thanks a mil Bertus

 

[bushtech]

@Martaine2005
It would be great to have a set of definitive voltages on the 2 transistors to work from.

 

[Martaine2005]

I agree. I should have them for mid afternoon. Currently 09:30 in UK.

Martin

 

[bushtech]

You're an hour behind me. Better than dealing with somebody in the states

 

[bertus]

Hello,

@bushtech , could you add the values and connections of the coils?


The picture ha a low contrast, it is hard to see some of the traces.

I think you have drawn the diodes of the bridge the wrong way around:



Bertus

 

[bushtech]

@bertus
Please let me know if this is better quality. Have corrected the diodes and added some values

 

[Martaine2005]

Yes, the bridge diodes were incorrect.
Well, I have checked both units. Both have approx same voltages. Except with the tube disconnected.
Tube disconnected and Q1. B 3.7V, C 330V and E 7V.
With tube connected, Q1. B 315V, C 310V and E 210V.

Same for the second unit.

Q2 on both units, C 315V. B and E 0V.
The same Ohm readings on both units as previously tested.
I don’t understand what the (diac) is doing. It’s on the B of Q2 but there are no voltages.

Martin

 

[bertus]

Hello,

It can be that the diac is only used for startup of the oscillator.
A kind of kick start.

Bertus

 

[bushtech]

Big thanks to Martin and Bertus
As I see it this is the situation:

         Q1
     Dries     Martin
B    0          3.7
C    138        330
E    0            7

        Q2
     Dries     Martin
B    138        0
C    315        315
E    138        0

Hmm. Now to figure this lot out

Moderators note : used code tags again

 

[Martaine2005]

The only supporting components for Q2 side are as follows:
R2, R5 and R6.
C5 and C7.
D5 and the D? + diac next to each other.
Perhaps Ohm out those components for a comparison. From negative of C2 and directly across each component.

I have to go out now so don’t have time.
Also, I don’t want to connect my scope to these voltages.

Martin

 

[bushtech]

Thanks Martin
Busy redrawing this whole lot so we can see whats going on

 

[bushtech]

I hope this is easier. The red figures are voltages in relation to neg of big cap. I haven't had time to analyse this

 

[Bluejets]

If all else fails, there are LED fluro type tubes out there which connect directly to the mains.
Just need to install a supplied fuse in the form of a fluro starter between both ends of the tube and you're done.

 

[bushtech]

Thanks Bluejets. Yes I am familiar with those fluoro leds. Busy systematically replacing the fluoros in my workshop with them. The trick will be finding a circular one.Only if someone has started making a replacement. It will probably be easier getting some 220 V COB leds and soldering them up in a circular shape

 

[bushtech]

Hi Martin

Please when you get a chance can you have a look at the voltages on both sides of these components. This is where the voltages change.
R1
D5
C5
R2
With tube removed. And in relation to neg. leg of C2
Thank you

Dries

 

[bertus]

Hello,

How about those led ring lights that are used with cameras?
https://www.amazon.com/s?k=led+ring...d=1599544296&rnid=2491147011&ref=sr_nr_p_72_1
They are available in different sizes.

Bertus