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Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
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Old 4th June 2021, 05:54 PM   #821
RickRay is offline RickRay  United States
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Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
There is another posting on this forum "How to build a 21st century protection board" that utilizes an arduino chip. It is complicated. Also, most amp boards would have some capacitance on the board itself and this won't cut that out.
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Old 4th June 2021, 06:07 PM   #822
xrk971 is offline xrk971  United States
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Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
If you use the posted “instant shutdown mod” trick to power the SSR, it will cut out in 100ms of power off and prevent turn off thump. Basically use a half bridge rectifier with two 1n400x diodes feeding a 22uF cap from the main power trafo secondaries. Take this small PSU and power the SSR power input jack with it. The moment the magnetic field collapses on the main power trafo, the 22uF cap decays in 100ms or so. Rather instantly and disengages the speakers from the amp. It works like a charm.

On the Gen2 RTR SSR, we provide an open collector logic control that could be connected to one’s own MCU to handle disconnect anyhow you like to program it.
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Old 10th June 2021, 04:00 PM   #823
fff0 is offline fff0  Singapore
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Its alive with bonus board!!

Planning to add RC delay later.
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Last edited by fff0; 10th June 2021 at 04:05 PM.
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Old 10th June 2021, 06:27 PM   #824
xrk971 is offline xrk971  United States
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Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
Hi Fff0,
Nice! Your photo is of darkness and two LEDs which I presume are the SSRs? Do you have a lighted photo you can share?
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Old 13th June 2021, 04:06 AM   #825
fff0 is offline fff0  Singapore
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Ha, my work is messy and lousy thus didnt dare to take a brighter work. Added 88Mohm to form a RC delay with the 4.7uf.

Tapped from existing supplies, luckily no ground loop heard on test speakers.
Initially, the bonus board output is wrongly connected but the 3 boards tolerated the error.
Somehow i believed it work as i accidentally short the speaker output and it turned off.


My humble suggestion for your consideration on next revision.
1. Square/ round pads, HI/ Low and pin 1/2 description together with A and K lettering are abit confusing for non engineer. + & - and or pictures will be better.
2. Speaker/ Amp I/O can be better spaced for lesser chance of short.
3. Revise post 1 to include build guide with pictures.
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Last edited by fff0; 13th June 2021 at 04:26 AM. Reason: Adding suggestions.
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Old 13th June 2021, 09:05 PM   #826
xrk971 is offline xrk971  United States
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Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
I’ll try to provide a better connection picture for the instant shutoff bonus circuit. Your solder joints could use a hotter iron. I feel like you may get some cold joints. Crimp Molex connectors were provided with the SSR. If you want to solder wires directly, remove the Molex KK header pins and solder to the board - not to the tips of the pins without insulation that’s asking for trouble. Also, you have a lot of exposed solder joints on what looks like high current or high voltage circuits. Be careful! Use crimp connectors for best reliability.

I have the bonus boards setup on the Xmas Amp and will go in and take some closeup photos of how this is hooked up:
Click the image to open in full size.
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Last edited by xrk971; 13th June 2021 at 09:09 PM.
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Old Yesterday, 10:45 AM   #827
vilding is offline vilding  Sweden
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Default speaker connections

Hi there!
Are the circled connections point for soldering speaker leads directly to the board? I have gen1.
Thanks!
/Hilding
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Old Yesterday, 11:42 AM   #828
xrk971 is offline xrk971  United States
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Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
I would use the larger holes where the Fastons are soldered. The circled is for test leads but could work.
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Old Yesterday, 01:27 PM   #829
vilding is offline vilding  Sweden
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Thanks for the quick answer! I connected it like this (see picture) and the amp shorts out. When speaker out from the amp is disconnected everything looks and measures fine? What have i gotten wrong?
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Old Yesterday, 08:18 PM   #830
xrk971 is offline xrk971  United States
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Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
Is your amp a BTL (bridge tied load) amp where the -ve terminal is not 0vdc? The gen1 SSR does not have an isolated -ve speaker connection. On Gen2 it is isolated.
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