I need an "ARCwelder"🙂
PS - just a 3 pair MT-200 was mine. I sold it. It did real good with 80Kuf X2 and a 500VA 50-0-50V.
Ran another sub with 35mm Xmax and a 75mm voice coil - all the way. Used a Spooky IPS.
PS - just a 3 pair MT-200 was mine. I sold it. It did real good with 80Kuf X2 and a 500VA 50-0-50V.
Ran another sub with 35mm Xmax and a 75mm voice coil - all the way. Used a Spooky IPS.
That's the voltage on the emitter resistors during the 50W 1Khz test signal. As you can see the bias floor is way above 80mV here. But I assume it does less harm than dipping to very low values.
Hello
I have almost finished my Wolverine EF-4 build. I have also made a speaker protect board using Bob Cordells design for detecting overcurrent/short circuit. It has also a speaker turn on delay, DC protect, overtemperature sense and evaluates power good from Microaudio SMPS. The board has no relays but uses SSR with power MOSFETs. For the logic a ATMEGA Tiny uC with simple code does it all.
Some pictures
Thanks for this DIY project to core team and all contributors!
-Felix
I have almost finished my Wolverine EF-4 build. I have also made a speaker protect board using Bob Cordells design for detecting overcurrent/short circuit. It has also a speaker turn on delay, DC protect, overtemperature sense and evaluates power good from Microaudio SMPS. The board has no relays but uses SSR with power MOSFETs. For the logic a ATMEGA Tiny uC with simple code does it all.
Some pictures
Thanks for this DIY project to core team and all contributors!
-Felix
Yes, why not..
Here is schematic, BOM and PCB and code for Tiny:
I have some leftover PCBs and can provide programmed ATMega Tiny 84 on request. (PCB + Tiny around € 10 per set + shipping cost)
Hi,
I‘m sorry the leftover boards are sold out. If you want i‘ll put you to the list for back order. Just PM me for your request.
-Felix
I‘m sorry the leftover boards are sold out. If you want i‘ll put you to the list for back order. Just PM me for your request.
-Felix
Does the tiny also use Arduino type programming ? I see where you can use a UNO to program it. I have
all AT324/ESP32 based stuff. The coding seems the same as the UNO. If I do this , I might go all SMD and add at least
opto/MOSFET's right on the amp board.
https://www.instructables.com/How-to-Program-an-Attiny85-From-an-Arduino-Uno/
Thank you !!! PS - has your circuit actually triggered with faults and saved speakers ? I had a AT324 based design save the day before.
OS
found a small error in the build guide v33, the link to the article by Rod Elliott about linear power supplies has an L at the end which it shouldnt have:
incorrect link: https://sound-au.com/power-supplies.html
correct link: https://sound-au.com/power-supplies.htm
Fantastic thread and best build guide I ever saw. So much inspiration from many beautiful builds here 🙂
incorrect link: https://sound-au.com/power-supplies.html
correct link: https://sound-au.com/power-supplies.htm
Fantastic thread and best build guide I ever saw. So much inspiration from many beautiful builds here 🙂
Hi OS
Yes the used ATTiny84 can be programmed using a UNO or even a Nano (which i use). You need to use the Arduino provided programmer to do so.
And yes i have tested speaker protection extensive. On short circuit the output get disabled within 2mS, defined by the RC 470R/2.2uF time constant. The Tiny just needs 30uS to switch the MOSFETs off.
The DC protection detects below 10Hz at full output power, which could be up to 100mS, but over current would come first.
Below you find the topview as it was photographed at some point during the build. The left two bridges from Onsemi where more cooperative then the right two from Vishay. The later are plated with a material that's difficult to solder. I drilled tiny holes in the bridge terminals for the capacitor leads. All cable shoes are soldered not shrunken. The aluminum plate is 100x200x5 mm. The red cables at the side running to the PCB are 4 mm2.
Hi, Guy's there are still a few second group buy boards available if anyone is interested in starting the fully tested and refined Wolverine project. Pm me, @jjs or @fireanimal if you like to order some complete with detailed Schematic, comprehensive BOM including mouser part numbers for 49v, 57v, 64v & 70v rails. Then you can put it all together with the 71 page illustrated color build guide
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