If that's the case, do I need to increase the voltage on the secondaries? Or will the BJTs simply not output the maximum power they are capable of with a voltage a bit lower than 71V?
Also, can I use capacitors rated for 80 Volts in the PSU?
John
Also, can I use capacitors rated for 80 Volts in the PSU?
John
Make sure you are tying together the PD+, ND- and NFB together before testing. See section 22, specifically 22.1 in the build guide for more information.
A couple of things I noticed from having a very quick look at your photos.
I don't see the IPS board plugged into the output stage board.
You can't drive a speaker load without output transistors installed.
The solder bridge on C1 is missing.
I don't see the 9.1k parallel resistor with R17 for low voltage power start up.
Check your oscilloscope probe is well connected.
Some more board photos would be good. It looks like the boards could do with a bit more cleaning.
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were you following the build guide?
Not related, but the use of thermal compound looks excessive.
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Hi TJ,
First off I would carefully go over all of the steps in the build guide, especially the checks before power up.
Let us know if find something obviously a problem with these steps first please.
Stuarts comments about the solder for the ground connections and the oscilloscope probe is very important to check also.
- Dan
The 4th group buy has been up for one month now. So I'll be finalising things this week. The order with the board house will be placed this weekend.
A big thank you to all the forum members who have registered. The response has been very well received.
If anyone is still sitting on the fence now is the time to get your order in before the 4th group buy opportunity closes.
I'll keep everyone informed once the order has been placed.
Thanks @danieljw @stuartmp and @mainframe99
I took off the IPS board just for a better view of the board.
Totally missed the C1 bridge, nice catch!!!!
Old heat compound + big squeeze = big mess. :~)
I do have to clean that up.
Will go over and retest everything when I get back from my jury duty. Inhaling solder fumes is much more interesting than looking a walls of a court house. 🙄
I took off the IPS board just for a better view of the board.
Totally missed the C1 bridge, nice catch!!!!
Old heat compound + big squeeze = big mess. :~)
I do have to clean that up.
Will go over and retest everything when I get back from my jury duty. Inhaling solder fumes is much more interesting than looking a walls of a court house. 🙄
I do have 1 Set of EF3-3 Boards left from the last group buy if there is anyone interested in those.
I went through the build forum here and did find the R17 9.1K parallel resistor (and pictures for my brain dead self) , but it is definitely not in the revision of the build guide that I have. It should be on page 37 of the build guide that I have (Rev 37 01-09-23), but it is not referenced. (irony must be my middle name). Did another read through and did a "Find" on the pdf and only two references to R17 but only toward the BOM installs.
Is there another newer build guide that is available ? Thanks.!!!!
Is there another newer build guide that is available ? Thanks.!!!!
The latest version is 41 07-10-2023 (dd-mm-yyyy)
See page 37, 38 & 51
Use your Dropbox Link to download the latest file.
I have had a bunch of inquiries on heatsinks, the new heatsinks are now available for those who were looking. These are flat black anodized, driver heatsink tapped, and pins installed. I currently have the CCS/VAS and predriver heatsinks on hand for EF3-4 boards, and the driver heatsinks arriving shortly for the EF3-3 boards. These heatsinks will only fit GB1-GB3 boards.
The new group buy boards will be using updated pin heatsinks, and whoever is interested in those can you let me know, so I have a rough idea on order qty.
I also received a bulk order of CPF emitter resistors. They are 500mOhm 1% 150ppm, they will be lead formed and ready to install.
Heatsinks
EF3-3 $65 - 2 CCS/VAS | 2 Predriver | 2 Driver
EF3-4 $40 - 2 CCS/VAS | 2 Predriver | No Driver Heatsink
Vishay Emitter Resistors
EF3-3 $70 Set of 24
EF3-4 $90 Set of 32
The new group buy boards will be using updated pin heatsinks, and whoever is interested in those can you let me know, so I have a rough idea on order qty.
I also received a bulk order of CPF emitter resistors. They are 500mOhm 1% 150ppm, they will be lead formed and ready to install.
Heatsinks
EF3-3 $65 - 2 CCS/VAS | 2 Predriver | 2 Driver
EF3-4 $40 - 2 CCS/VAS | 2 Predriver | No Driver Heatsink
Vishay Emitter Resistors
EF3-3 $70 Set of 24
EF3-4 $90 Set of 32
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hi,
Is it safe to assume, that wirewound resistors series:
VISHAY MRA: non-inductive, non-magnetic / 1% 90ppm 4or7W
OHMITE WH/Wn: WN non-inductive / 1% 90ppm 5W
YAGEO: NKN non-inductive [max inductance 0.15uH ] / 2or5%
are safe to use as emiter resistors or R114-R121 /1W versions?
Is it safe to assume, that wirewound resistors series:
VISHAY MRA: non-inductive, non-magnetic / 1% 90ppm 4or7W
OHMITE WH/Wn: WN non-inductive / 1% 90ppm 5W
YAGEO: NKN non-inductive [max inductance 0.15uH ] / 2or5%
are safe to use as emiter resistors or R114-R121 /1W versions?
VISHAY MRA are designed for audio, because they are kind of expensive you will not find them in audio amplifiers too often,
people use them more to upgrade their speaker crossovers, some will say they are “boutique” resistors.
people use them more to upgrade their speaker crossovers, some will say they are “boutique” resistors.
If the 50v is loaded voltage then the unloaded idle voltage may be 55v . This will put 78 ish volts on your caps. Your rating dhould be 100v
I'm thrilled to report that our 4th group buy has been a massive success! We've been completely blown away by your enthusiastic response, and it's clear we've gathered a fantastic community here.
Here are the latest updates:
- The PCBs are currently loaded and waiting at the PCB house. After rechecking the boards everything is set to move forward smoothly.
- Color Selection: As voted by the majority, the PCBs will feature a matte black finish. We're excited to see how these new boards turn out. Matte black is one of my favourites.
- I will finalize the order on Monday when the PCB house reopens.
Thank you all for your active participation and support you've given to the Wolverine project. This wouldn't have been possible without you guy!
Stay tuned for more updates after we finalize the order and production begins.
Here are the latest updates:
- The PCBs are currently loaded and waiting at the PCB house. After rechecking the boards everything is set to move forward smoothly.
- Color Selection: As voted by the majority, the PCBs will feature a matte black finish. We're excited to see how these new boards turn out. Matte black is one of my favourites.
- I will finalize the order on Monday when the PCB house reopens.
Thank you all for your active participation and support you've given to the Wolverine project. This wouldn't have been possible without you guy!
Stay tuned for more updates after we finalize the order and production begins.
Hi Andy,
I'm interested in a set for an ef3-4 original version, could you add me to the list or pm me the details?