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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 27th July 2019, 03:55 PM   #1
xrk971 is offline xrk971  United States
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Join Date: Oct 2012
Location: Metro DC area
Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
Default Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB

Edit Oct. 22, 2019: The full production run has been delivered. They look great!
Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB

Edit Oct. 15, 2019: Here is a photo of the sample unit we tested before we gave the OK for the full production run:
Click the image to open in full size.

Edit: Oct. 15, 2019: We just received news that all 120 units of the first production run have been completed. Should be shipping them out soon.

Jhofland has developed a superb, simple, compact solid state relay (SSR) DC speakere protection and turn-on delay circuit that is similar to the one used in the ABBB amp. JPS64 did the layout on this, and together, we now have a very nice SSR protection circuit that works "like a wire". It uses very compact SMT parts and the whole board is only 75mm x 35mm per channel. An assortment of connection options are availble ranging from usual spade Fastons to Molex Minifit 4-pin locking jacks, or even plain old soldered flying leads. The circuit uses a topology designed by Jhofland to sense a small DC offset via an opto-coupler isolator and a comparator. The comparator drives another optoisolator to activate back-to-back ultra-low RDson MOSFETs as the SSR. A second comparator provides the 3 second time delay when powering on to avoid turn-on speaker thump. The circuit is powered from the conveniently available +ve DC rail of the amplifier's PSU (range is circa +20v to +100Vdc). The supply voltage is reduced and regulated to a constant value on board via a regulator for consistent performance despite variations in the supply rail voltage.

Initial testing of the SSR DC Protect circuit revealed that when it is on, it truly acts and measures as if it were a piece of high current wire. No noticeable artifacts in the time domain were visible on an O-scope, and FFT's also revealed that it had no effect on the harmonic distortion profile either.

Specifications:
- PCB size is 70mm x 35mm and the M3 screw mounting holes are 62mm x ~26.5mm
- Requires > +19vdc power supply (can use +ve rail from your amp) and internally regulated to 15v
- Fully tested for 100w rms continuous load into 8ohms
- Fully tested to handle 48vdc continuous DC fault
- 3 second turn on delay
- For a 48vdc fault, turn-off time is 25 milliseconds, 1.5v thrreshold

The best part of all is that we will be offering this as a proefessionally built and fully-tested, ready-to-run (RTR) unit. The user just has to solder on his/her own choice of spade terminals or Molex Minifit Jr connectors, or flying leads, the +ve supply via a JST connector or flying leads, and then go and use it.

Thanks to Jhofland for the design, and JPS64 for the layout.

3D render of intitial version for testing and verifcation:
Click the image to open in full size.

Photo of verification build with Faston connectors:
Click the image to open in full size.

O-scope screenshot of signal at 100wrms into 8ohms with (yellow) and without (blue) - they are indentical and thus perfectly overlaid. Test with Hafler Class AB amp and resistive load:
Click the image to open in full size.

Edit Aug 7, 2019: New data with VHEX+ amp for 40Vpp into 8ohm load (25wrms) showing harmonic distortion components from H2 through H5 vs Frequency and THD for case without SSR Protection in place:
Click the image to open in full size.

Same data with SSR Protection in place:
Click the image to open in full size.

Comparison with overlay of above THD data for both cases:
Click the image to open in full size.

Comparison of THD vs Power into 8ohm load with and without SSR Protection in place:
Click the image to open in full size.

Typical FFT without SSR Protection in place at 25wrms into 8ohms:
Click the image to open in full size.

Typical FFT with the SSR Protection in place at 25wrms into 8ohms:
Click the image to open in full size.

For more technical details of this test, see this post:
Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB

Update August 7, 2019: Pre-orders are now being taken from my shop here. Price for fully built and tested unit is $40ea with Free Shipping in the US; $10 shipping to Canada; $15 shipping to everywhere else.

Update July 29, 2019:
Current interest list shows almost 100 units. Looks like this is a definite go! Latest render with voltage regulator IC and transzorb diode for protection:
Click the image to open in full size.

With vertical Molex Minifit Jrs:
Click the image to open in full size.

With Faston spades:
Click the image to open in full size.

Schematic of pre-production unit:
Click the image to open in full size.
Attached Images
File Type: jpg SSR-DC-Protect-Render-01.jpg (367.1 KB, 1556 views)
File Type: jpg SSR-DC-Protect-Verification-Build-01.jpg (252.9 KB, 1724 views)
File Type: jpeg SSR-DC-Protect-100w-8ohms-with-without-Oscope.jpeg (111.1 KB, 1589 views)
File Type: jpg No-SSR-Protect-2.88vrms-8ohms-FFT.jpg (183.2 KB, 544 views)
File Type: jpg SSR-Protect-2.88vrms-8ohms-FFT.jpg (181.9 KB, 544 views)
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Last edited by xrk971; 22nd October 2019 at 03:15 PM.
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Old 27th July 2019, 05:06 PM   #2
xrk971 is offline xrk971  United States
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Join Date: Oct 2012
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Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
Here is the initial schematic with a zener diode voltage regulator (final version with use a dedicated voltage regulator IC).

Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB-ssr-dc-protect-schem-v1-jpg
Attached Images
File Type: jpg SSR-DC-Protect-Schem-v1.jpg (203.5 KB, 1641 views)
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Old 27th July 2019, 05:33 PM   #3
pinnocchio is offline pinnocchio  Canada
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Location: Montreal
Depending on pricing I would buy 2-3 sets

Thanks
Do
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Old 27th July 2019, 05:39 PM   #4
xrk971 is offline xrk971  United States
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Join Date: Oct 2012
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Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
RTR SSR Protection GB Interest List (you are free to remioe your name or change qnty if the price isn't what you expected it to be):

Quote:
xrk971 - 4 units - USA
pinnocchio - 6 units - CAN
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Old 27th July 2019, 06:18 PM   #5
Vunce is online now Vunce  United States
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Join Date: Jan 2014
Location: LI, NY
Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
xrk971 - 4 units - USA
pinnocchio - 6 units - CAN
Vunce - 4 units - USA
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Old 27th July 2019, 06:28 PM   #6
Miggie78 is offline Miggie78  Finland
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Join Date: Nov 2016
Location: Jyväskylä
xrk971 - 4 units - USA
pinnocchio - 6 units - CAN
Vunce - 4 units - USA
Miggie78 - 2 units - FINLAND
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Old 27th July 2019, 09:56 PM   #7
nautibuoy is offline nautibuoy  United Kingdom
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Join Date: Jan 2010
Location: Somerset, England
xrk971 - 4 units - USA
pinnocchio - 6 units - CAN
Vunce - 4 units - USA
Miggie78 - 2 units - FINLAND
Nautibuoy - 2 units - UK
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Old 27th July 2019, 11:17 PM   #8
wtl is offline wtl  Australia
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Join Date: Mar 2012
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Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
Quote:
Originally Posted by nautibuoy View Post
xrk971 - 4 units - USA
pinnocchio - 6 units - CAN
Vunce - 4 units - USA
Miggie78 - 2 units - FINLAND
Nautibuoy - 2 units - UK
WTL-4units-Australia
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Old 27th July 2019, 11:25 PM   #9
gary s is offline gary s  Australia
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Join Date: Nov 2002
Location: Australia
xrk971 - 4 units - USA
pinnocchio - 6 units - CAN
Vunce - 4 units - USA
Miggie78 - 2 units - FINLAND
Nautibuoy - 2 units - UK
gary s - 4 units - AUSTRALIA
WTL- 4units - AUSTRALIA
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Old 27th July 2019, 11:26 PM   #10
xrk971 is offline xrk971  United States
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Join Date: Oct 2012
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Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
GB Interest List
Quote:
xrk971 - 4 units - USA
pinnocchio - 6 units - CAN
Vunce - 4 units - USA
Miggie78 - 2 units - FINLAND
Nautibuoy - 2 units - UK
WTL - 4 units - AUS
Thanks for the interest guys! At this rate we will make 50 units easily.
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