Possibly within Christmas. As soon as the prototypes are tested and fine tunings have been made into the final design the V4H GB will start. 🙂
Hi asuslover.
I can arrange but these are quite expensive at 19 dollar per MOSFET. At quantities of 10 MOSFETs of each polarity or more I can get them at 17 dollar per MOSFET.
I can arrange but these are quite expensive at 19 dollar per MOSFET. At quantities of 10 MOSFETs of each polarity or more I can get them at 17 dollar per MOSFET.
Sounds interesting, do you have any early guidance around power supply requirements? This would be great so I could potentially upgrade using the same PSU / chassis I build for the V4.
It will require a basic +/-56V PSU for 250W into 4ohm load. Transformer will need to be 40-0-40 with at least 700VA for two channels or 350VA for one channel, or a 700W SMPS for two channels. For 8ohm load it will need 500VA for two channels as output will be around 160W per channel.
Ordered a couple prototypes of the semi-final layout of the dual-MOSFET 250W PeeCeeBee, the V4H!😉
I know I'm in the minority but I would prefer the Mosfets to be twisted around 90 degrees so they are at the top of the PCB and not completely underneath it.
Great work. Thanks for sharing.
My pleasure.
Yes that orientation does have its advantages and in the past I did release a couple layouts that allowed for it. Advantages of having them underboard outnumber other methods. I like it for its simplicity of mounting, heatsink sharing with VAS transistors and saving of space inside chassis.
Yes that orientation does have its advantages and in the past I did release a couple layouts that allowed for it. Advantages of having them underboard outnumber other methods. I like it for its simplicity of mounting, heatsink sharing with VAS transistors and saving of space inside chassis.
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I always use MakerBeam XL parts or similar, buying some heat-sinks which fit to the measurements and let make the top/bottom and front/back plates from a laser shop by my own drawings. Even if You would do it in V4A it´s cheaper then a case from Modu.
Future Layout ...
... and a little bit more space to have the possibility to avoid this awful faston connectors ...
... and a little bit more space to have the possibility to avoid this awful faston connectors ...
GB Update: Received a message from maker mentioning that boards will be shipped on 20. Takes a couple days to reach here so should be home on 22 or 23. 🙂
Thanks for being patient.
Thanks for being patient.
For example ...
If there is enough space for screw terminals, there is place for everything,
and everybody can choose the prefered (faston, screw, PCB terminal blocks, ...).
Meanwhile, the CRC PSU is almost ready.
It will have two independent fully discrete speaker protection circuits powered directly from the rails with equal loading on both rails and no need for a 12V PSU, smooth bypassing of rail resistors during high transient current demand, pads for both TO220 and TO247 diodes that can be mounted underboard and fixed on chassis floor requiring no additional heatsinking, accommodation for relays in different form factors with 10/20/30A contacts and MOSFET driving of relays if desired. There will be two variations, one for center tapped and another for split secondary transformers.
Ordering prototype with 10A relay pads, no fuse holders and center tap AC for error checking and tuning early next week.
This Christmas is going to be exciting for sure! 😉 🙂
Edit: This is the PeeCeeBee PSU! Ambiguous name as usual. 😀
It will have two independent fully discrete speaker protection circuits powered directly from the rails with equal loading on both rails and no need for a 12V PSU, smooth bypassing of rail resistors during high transient current demand, pads for both TO220 and TO247 diodes that can be mounted underboard and fixed on chassis floor requiring no additional heatsinking, accommodation for relays in different form factors with 10/20/30A contacts and MOSFET driving of relays if desired. There will be two variations, one for center tapped and another for split secondary transformers.
Ordering prototype with 10A relay pads, no fuse holders and center tap AC for error checking and tuning early next week.
This Christmas is going to be exciting for sure! 😉 🙂
Edit: This is the PeeCeeBee PSU! Ambiguous name as usual. 😀
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