Nice work! Do you think this one would be stable if I ran short wires from the LatFET pads to TO-3 sockets? I could put 470 and 330 ohm resistors close to the sockets, rather than on the boards. (I have several old Hitachi TO-3 latFETS that I could use)
thanks,
Steve.
Hi Steve,
I believe, it will be ok. In fact, I have live-tested the lateral FETs option with 2 pairs of FETs on a separate board, having the gate stoppers on that board as well. The board was connected to the front-end with some 8-10 centimeter (3-4 inch) wires. That configuration worked with no issues.
The test arrangement is shown on the picture in POST #225 - the front-end is a separate PCB and you can see how far the output FETS are.
Cheers.
Valery
Excellent! Very cool snap-on local heatsinks.
Jeff, I think a light version of 21-st century board on a single pcb would be nice. We don't need inrush at this power rating - only time delay and dc protection for the speakers. Standby transformer is also not required.
Jeff, I think a light version of 21-st century board on a single pcb would be nice. We don't need inrush at this power rating - only time delay and dc protection for the speakers. Standby transformer is also not required.
I've got one half layed out. Both outputs on one board. My main transformer has 15V outputs that will work great to power it.
I'm also adding provisions to monitor temperature (I2C). It might be nice to have a temperature warning and remove the output load on overheat.
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Nice work - looks great. What kind of VA rating and voltage rail power supply are you using?
That looks nice ! You made the case from raw milled aluminum plates? What's that small board next to the output posts?
It's a solid state speaker relay design using mosfets. There's a standard analog DC detection on board connected to a microcontroller. The DC detection directly switches the mosfets off on fault and signals the microcontroller. The microcontroller then will signal a fault warning with the front panel LED. The microcontroller manages on delay and shut down. It also monitors temperature, and will disconnect a speaker if the amplifier is overheating. The board is expandable to do almost anything via I2C or SPI as well. I've got supplies with rail shutdowns for larger power designs. I'm also starting to experiment with current monitoring over I2C.
You deserve to start a VHex build thread, I was thinking of updating the first post but the thread title is misleading.
A group of fellow countrymen based in china who are also in the industry managed to fabricate my board design. The prototype will be subjected to hardware testing but the final build will be brought here in my country.
Albert
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vHEX build completed
The BOM arrived from Digikey today and I put it together rather quickly. Just finished the assembly but not tested yet. Will do tomorrow with a fresh set of eyes. It was a nice build with a mix of SMT and thru holes. The SMT work actually went really fast once I got the hang of it again. Thanks to Jwilhelm for providing the boards.
The BOM arrived from Digikey today and I put it together rather quickly. Just finished the assembly but not tested yet. Will do tomorrow with a fresh set of eyes. It was a nice build with a mix of SMT and thru holes. The SMT work actually went really fast once I got the hang of it again. Thanks to Jwilhelm for providing the boards.
