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Old 03-22-2022, 10:51 AM   #61
redwire
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Default Re: Finally built the Bob Parker "Blue" ESR Meter

I measure around 10mA idling, 25mA when testing, and under 0.1uA when off. It's a 5V device with LP2950 LDO (max. 30V in) and extra BJT power switch.
Most important is the test current can be a decent 50mA narrow pulse (low average though) so it's not easily fooled.

Here's some 4,700uF caps I tested with it and AN8008 readings for the laugh.
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Last edited by redwire; 03-22-2022 at 10:54 AM..
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Old 03-22-2022, 01:25 PM   #62
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Default Re: Finally built the Bob Parker "Blue" ESR Meter

so probably 15-18 hours of use on a full 500ma charge, not bad
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Old 03-22-2022, 04:22 PM   #63
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Default Re: Finally built the Bob Parker "Blue" ESR Meter

I saw spikes of around 35mA but about 12mA idle and 25-28 with the leads shorted or while testing a capacitor.
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Old 03-22-2022, 09:39 PM   #64
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Default Re: Finally built the Bob Parker "Blue" ESR Meter

Quote:
Originally Posted by Bob Parker View Post
So far I haven't heard of even one microcontroller failure due to connecting the Blue meter to charged high voltage capacitors. In fact the late John Bachman at Anatek who I collaborated with actually tried connecting one of the meters to bigger and more highly charged capacitors until it started blowing tracks off the PCB, but the microcontroller survived.

I only designed the ESR meter to help with my own repairs. I submitted it to a local magazine as a construction project, and the editor gave me a look like "Why would anyone want to measure a capacitor attribute which no one has ever heard of?". But kit sales just exploded and have stayed high for 1/4 of a century.

I'm sure that Andy at Alltronics who makes the kits now would help out if anyone needed a replacement microcontroller IC. He's that kinda guy.
Blowing tracks off the PCB Wow! You had the hindsight to use special fusible link tracks! That meter was over engineered .Lol

Cool story on the magazine construction project! I bet that editor understood a lot more about your project when your kit sales took off.

Glad you have a such a good guy as Andy making up the kits for you and I feel a lot better about the longevity of my blue after reading your posts!

Thank`s for all the information Bob and thank`s again for making the Blue!
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Old 03-23-2022, 12:15 AM   #65
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Lightbulb Re: Finally built the Bob Parker "Blue" ESR Meter

Quote:
Originally Posted by jayjr1105 View Post
I saw spikes of around 35mA but about 12mA idle and 25-28 with the leads shorted or while testing a capacitor.
Thanks for the measurements. I don't actually have a Blue meter with me, and I was quoting the figures for the original Dick Smith ESR meter. I kinda forgot that the blue LEDs with their higher voltage drop reduce the meter's current consumption.
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Old 03-23-2022, 12:24 AM   #66
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Smile Re: Finally built the Bob Parker "Blue" ESR Meter

Quote:
Originally Posted by volkswagenvan View Post
Blowing tracks off the PCB Wow! You had the hindsight to use special fusible link tracks! That meter was over engineered .Lol

Cool story on the magazine construction project! I bet that editor understood a lot more about your project when your kit sales took off.

Glad you have a such a good guy as Andy making up the kits for you and I feel a lot better about the longevity of my blue after reading your posts!

Thank`s for all the information Bob and thank`s again for making the Blue!
You're the first person who's noticed the thinner "fusible" PCB track. 👍 Andy's doing his own thing with the Blue meters. My only involvement now is supporting people who build them and have a problem, and pop up on the Alltronics discussion forum.

The editor quickly found out what the ESR meter was designed for, and even did a little article about getting one of the Dick Smith meters and using it!

None of us ever expected it to become well known. It's been a surprising 26 year long "journey". 🙀
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Old 03-24-2022, 05:47 PM   #67
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Default Re: Finally built the Bob Parker "Blue" ESR Meter

None of us ever expected it to become well known. It's been a surprising 26 year long "journey". 🙀[/QUOTE]

I`m sure it will be around another 26+ years to come!
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Old 03-24-2022, 09:39 PM   #68
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Default Re: Finally built the Bob Parker "Blue" ESR Meter

Quote:
Originally Posted by volkswagenvan View Post
None of us ever expected it to become well known. It's been a surprising 26 year long "journey". 🙀
I`m sure it will be around another 26+ years to come![/QUOTE]

That's if the Zilog microcontroller chips are still available. They're already being called "vintage" by some people.
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Old 03-24-2022, 10:27 PM   #69
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Default Re: Finally built the Bob Parker "Blue" ESR Meter

[QUOTE=Bob Parker; They're already being called "vintage" by some people. [/QUOTE]

Lol, So am I !
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Old 03-25-2022, 01:10 AM   #70
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Default Re: Finally built the Bob Parker "Blue" ESR Meter

I have had mine for many years now and it still works very well in fact I just bought another one recently I going to take the first one and change it to run on 5 volts so when I check a lot of caps I do not have to keep turning it back on all the time

I also bought the ring tester as well and several times it saved my a** when trying to figure out why a switching power supply transformer end up being shorted and that why it was blowing the main fuse
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Old 03-25-2022, 05:19 AM   #71
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Default Re: Finally built the Bob Parker "Blue" ESR Meter

i built that ring tester on stripboard - couldnt have done without it fixing crt tv's/monitors!
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