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Old 14th March 2019, 10:19 PM   #81
rayma is online now rayma  United States
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Quote:
Originally Posted by Trismos View Post
I just ran out to the hardware store to pick up parts for a bulb tester
Remember that the light bulb is in series with ONE of the AC line wires.
It is NOT in parallel with the AC line (like normal). See this diagram:
https://antiqueradio.org/art/DimbulbSketch.jpg

Last edited by rayma; 14th March 2019 at 10:29 PM.
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Old 14th March 2019, 11:50 PM   #82
Trismos is offline Trismos  Canada
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Quote:
Originally Posted by rayma View Post
Remember that the light bulb is in series with ONE of the AC line wires.
It is NOT in parallel with the AC line (like normal). See this diagram:
https://antiqueradio.org/art/DimbulbSketch.jpg
or this? I believe it may have come from the same site you found your link:

Dim-bulb V2.jpg
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Old 14th March 2019, 11:56 PM   #83
rayma is online now rayma  United States
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Originally Posted by Trismos View Post
or this?
That diagram is a bit too ambiguous and incomplete, so stay with the first one.
Technically, the black (hot) lead should be the one with the switch and light bulb.
The other lead (white) is the neutral.

If you have a 3 wire IEC socket on the power supply, the safety ground is
carried through as normal, just the same as the neutral wire is.

Last edited by rayma; 15th March 2019 at 12:09 AM.
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Old 15th March 2019, 12:35 AM   #84
Trismos is offline Trismos  Canada
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Quote:
Originally Posted by rayma View Post
That diagram is a bit too ambiguous and incomplete, so stay with the first one.
Technically, the black (hot) lead should be the one with the switch and light bulb.
The other lead (white) is the neutral.

If you have a 3 wire system, the safety ground is just carried through as normal,
like the neutral wire is.
Between the two I found the first one more ambiguous - which was hot and what was occurring at the plug - so ended up building the one I showed you. It looked like the neater package. What might be a simple way of testing this thing?
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Old 15th March 2019, 12:51 AM   #85
rayma is online now rayma  United States
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Originally Posted by Trismos View Post
What might be a simple way of testing this thing?
Don't plug either end of the tester into anything.
Install the bulb. If there is a switch in the tester, turn it on.

Use an ohm meter across the wide blade (neutral) and narrow blade (hot) of the tester plug.
This should be an open circuit.
Same between the wide blade and safety ground.
Same between the narrow blade and safety ground.

Now measure ohms from the wide blade to the wide receptacle in the socket end.
Should be a short.

Now measure ohms from the narrow blade to the narrow receptacle in the socket end.
Should be around 10 ohms (the light bulb cold resistance).
If it's an open circuit, the bulb may be bad, or the switch may be off.

Now measure ohms from safety ground pin to safety ground receptacle in the socket end.
Should be a short.

If it passes these tests, it should be ok.
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Old 15th March 2019, 01:12 AM   #86
Trismos is offline Trismos  Canada
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Quote:
Originally Posted by rayma View Post
Don't plug either end of the tester into anything.
Install the bulb. If there is a switch in the tester, turn it on.

Use an ohm meter across the wide blade (neutral) and narrow blade (hot) of the tester plug.
This should be an open circuit. Check!
Same between the wide blade and safety ground. Check!
Same between the narrow blade and safety ground. Check!

Now measure ohms from the wide blade to the wide receptacle in the socket end.
Should be a short. Hmmmm 15 ohms ... I see if I move the bulb to the other socket though, then it's a short.

Now measure ohms from the narrow blade to the narrow receptacle in the socket end.
Should be around 10 ohms (the light bulb cold resistance). 15.6 ohms
If it's an open circuit, the bulb may be bad, or the switch may be off.

Now measure ohms from safety ground pin to safety ground receptacle in the socket end.
Should be a short. And check.

If it passes these tests, it should be ok.
Thanks very much Rayma, that was extremely helpful.
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Old 15th March 2019, 01:53 AM   #87
Trismos is offline Trismos  Canada
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Okay then. The bulb lit up for a sec and then dimmed right out. The resistors for the LEDs on the PSU showed up so I installed them earlier. ... one of them has chosen not to light up. At this stage I guess we can take the light bulb tester out of the circuit?
I have 24.9 out of the V+ / GND and 25 out of GND3 / V-.
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Old 15th March 2019, 01:58 AM   #88
Trismos is offline Trismos  Canada
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I have 22.9v across the resistor R20 that has the working LED. I have nothing at R21.
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Old 15th March 2019, 02:24 AM   #89
rayma is online now rayma  United States
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Quote:
Originally Posted by Trismos View Post
one of them has chosen not to light up.
You may have that LED in backwards. Is it reversed compared to the other side?
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Old 15th March 2019, 03:57 AM   #90
Trismos is offline Trismos  Canada
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Originally Posted by rayma View Post
You may have that LED in backwards. Is it reversed compared to the other side?
I may indeed! I will check it tomorrow. Getting to be a pain to pull that board in and out now. Thx for the hint.
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