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How to build a 21st century protection board
How to build a 21st century protection board
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Old 22nd October 2017, 01:39 PM   #1571
jwilhelm is online now jwilhelm  Canada
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Thanks Thimios.

I've written a basic protocol I plan to use for the first test.

0000 - off
0001 - tube preheat
0010 - 1st supply inrush
0011 - second supply inrush
0100 - power on
0101 - speakers on
0111 -
1000 - DC Offset
1001 - overload
1010 - AC Failure
1011 - overtemp 1
1100 - overtemp 2
1101 -
1110 -
1111 -

This would be simple to read with a port expander.
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Old 22nd October 2017, 02:22 PM   #1572
vzaichenko is offline vzaichenko  Russian Federation
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How to build a 21st century protection board
For the same purpose, I've started experimenting with a tiny front-panel module, incorporating a 32-bit processor, OLED display, WiFi module and some input/output pins. Beer bottle cap is placed nearby as a scale - the board is really compact, worth $10 USD.

My first test sketch does the following:
1) Connects to the internet via local WiFi;
2) Communicates with NTP server, receiving the packet;
3) Syncs its internal clock with NTP time from the packet;
4) Calculates the timezone and shows correct time on the display, updating it once in a second.

The thing is very fast and versatile, so now we will likely start using it for indicating the soft-start sequence phases, error codes, heatsink temperatures, as well as logging telemetry at the web portal.

We're moving deeper into the 21-st century guys
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File Type: png NTP_time_clock.png (301.8 KB, 456 views)
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Old 22nd October 2017, 02:29 PM   #1573
thimios is offline thimios  Greece
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Quote:
Originally Posted by vzaichenko View Post
For the same purpose, I've started experimenting with a tiny front-panel module, incorporating a 32-bit processor, OLED display, WiFi module and some input/output pins. Beer bottle cap is placed nearby as a scale - the board is really compact, worth $10 USD.

My first test sketch does the following:
1) Connects to the internet via local WiFi;
2) Communicates with NTP server, receiving the packet;
3) Syncs its internal clock with NTP time from the packet;
4) Calculates the timezone and shows correct time on the display, updating it once in a second.

The thing is very fast and versatile, so now we will likely start using it for indicating the soft-start sequence phases, error codes, heatsink temperatures, as well as logging telemetry at the web portal.

We're moving deeper into the 21-st century guys
Hi Valery,i'm sure that you can move deeper,your application engineer Jeff is the right person in the right position!
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Old 9th November 2017, 10:34 PM   #1574
jwilhelm is online now jwilhelm  Canada
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Amp control 6.01 is ready to power up. This one has connections for data logging. Let the fun begin!
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File Type: jpg Amp Control V6.01.jpg (124.0 KB, 403 views)
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Old 10th November 2017, 06:27 AM   #1575
thimios is offline thimios  Greece
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Originally Posted by jwilhelm View Post
Amp control 6.01 is ready to power up. This one has connections for data logging. Let the fun begin!
Many projects at the same time!
Perfect!
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Old 29th October 2018, 08:40 AM   #1576
Harry3 is offline Harry3  Australia
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Originally Posted by jwilhelm View Post
Are you planning to etch one yourself?
Hi Jeff
When you have time can you please check the schematic in post 737?
I think the opto coupler on the negative supply is not correctly connected to the MOSFET gate. The PCB is OK.

Thanks
Harry
PS I realise you have parallelled the opto on the PCB and the schematic is slightly different.
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Old 29th October 2018, 09:40 AM   #1577
vzaichenko is offline vzaichenko  Russian Federation
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How to build a 21st century protection board
Quote:
Originally Posted by Harry3 View Post
Hi Jeff
When you have time can you please check the schematic in post 737?
I think the opto coupler on the negative supply is not correctly connected to the MOSFET gate. The PCB is OK.

Thanks
Harry
PS I realise you have parallelled the opto on the PCB and the schematic is slightly different.
Hi Harry,

I will take a liberty to answer - you're right, in both cases, the cathodes (pins 5, 7) have to be connected to the gates. BTW, the optocoupler's outputs don't necessarily have to be paralleled - in the latest version of the PSU board we use a single optocoupler to control both + and - rails.

Cheers,
Valery
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Last edited by vzaichenko; 29th October 2018 at 09:51 AM.
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Old 29th October 2018, 10:17 AM   #1578
Harry3 is offline Harry3  Australia
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Many thanks
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Old 29th October 2018, 11:58 AM   #1579
jwilhelm is online now jwilhelm  Canada
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The early schematics using the ASSR optocouplers are often incorrect. I downloaded a component for Diptrace that was drawn incorrectly which caused lots of mistakes and confusion until I figured out what was wrong. I've since learned out how to create my own components.
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