No, these are really just cosmetic changes. They were also made to provide the builder with more options and component choices. All modifications can be achieved with the existing boards except for the ability to use the smd melf resistors which was added just to provide more options.
The only changes that I would make are the modifications to the capacitance multipler and R130, R131 which has already been discussed and the information provided
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Hi Stuart,
Should owners of the PCBs from the first GB, who had not built populated them yet, try to incorporate these changes, or should we be contented and happily building them as per original?
The new additions just provide more component choices for the builder and get rid of some unnecessary and unused components.
If you use the components from the latest bom and follow the latests schematic you will have no problems and your build will not suffer any degrade in performance.
The precision of R5, R26 is not particularly important.
I just joined the Wolverine club and after reading big parts of the discussion thread and the build thread i want to thank everyone who contributed to this project. I am really looking forward to build my first Class A/B amp.
While waiting for my Mouser order to arrive I was thinking about the PSU. Did i get it right that a pair of bridge rectifiers and a filter capacitance of 2x 10.000 uF is sufficient as raw PSU?
I searched for PCBs to mount the caps, but then i found a PCB design by diyaudio member @prasi . I intend to mount the SIP bridge rectifiers to the base plate underneath the board, that would free a lot of space in the small 4U 300 enclosure - plus it will reduce the amount of wiring to be made. I want to go dual mono with two transformers, so i need double the space for my PSU. The board also offers mounting pads for snubber parts for the transformer secondaries.
The board design is intended to be used as a CRC PSU, but i am planning to stuff the resistor positions with 1mm wire, so the PSU shall become a "C" instead of "CRC" design. Will this work? Please see the picture attached, wire bridges marked on the upper side of the PSU PCB.
Link to the CRC PSU thread
edit: added link to forum thread about this psu
While waiting for my Mouser order to arrive I was thinking about the PSU. Did i get it right that a pair of bridge rectifiers and a filter capacitance of 2x 10.000 uF is sufficient as raw PSU?
I searched for PCBs to mount the caps, but then i found a PCB design by diyaudio member @prasi . I intend to mount the SIP bridge rectifiers to the base plate underneath the board, that would free a lot of space in the small 4U 300 enclosure - plus it will reduce the amount of wiring to be made. I want to go dual mono with two transformers, so i need double the space for my PSU. The board also offers mounting pads for snubber parts for the transformer secondaries.
The board design is intended to be used as a CRC PSU, but i am planning to stuff the resistor positions with 1mm wire, so the PSU shall become a "C" instead of "CRC" design. Will this work? Please see the picture attached, wire bridges marked on the upper side of the PSU PCB.
Link to the CRC PSU thread
edit: added link to forum thread about this psu
Attachments
It's personal preference. I bought 4 Kemet 36.000 uF caps with screw terminals, 2 Onsemi bridge rectifiers, 1 Amplimo 1 kVA toroid and some foil caps, this for a stereo supply.
While looking throug specs of various caps, I found large differences in ESR and life expectance, this brought me to my choice.
While looking throug specs of various caps, I found large differences in ESR and life expectance, this brought me to my choice.
Because the low-pass filter propertys; Resistance, Phase-shift and Delay.
Hi Scott, This has been discussed in detail in the development thread. Please search that to find your answer. Basically it's not ideal to have your rail voltage changing as the load increases.
Hi Guy's,
I've started to send out payment requests for the 2nd group buy. This will take a few days to complete. Once I receive your payment I'll send you the Dropbox Link so you can access all the documentation for the Wolverine project. Please allow a few days for this to happen as its not the only thing that I have going on.
I will let everyone know when I have sent out all the payment requests.
I've started to send out payment requests for the 2nd group buy. This will take a few days to complete. Once I receive your payment I'll send you the Dropbox Link so you can access all the documentation for the Wolverine project. Please allow a few days for this to happen as its not the only thing that I have going on.
I will let everyone know when I have sent out all the payment requests.
I would be interested to know if the cap multiplier is necessary. A constant current source is used in the path.
Hi Guy's, just letting you all know that I have sent out all the payment requests. Please check your PayPal account if you haven't received it.
If you still haven't received it please send me a pm.
If you still haven't received it please send me a pm.
This amp has many design features to achieve its very low noise and distortion and the multiplier plays a big role in this.
👍 @Johno
Hi guys,
I have decided too to join this great project in the 2nd GB so let me join this interesting debate.
Why would someone start a very high-quality project and then destroy it for the sake of saving a few pennies on an essential element? Based on my limited experiences, I can conclude that the use of a capacitance multiplier always improves operation of the amplifier. My all measurements support this conclusion. This is not my opinion, I am talking in terms of measurable facts.
An amplifier, in simplistic terms, basically modulates the available power so why deprive it of the chance for great performance just for slightly lower overall cost. There are some excellent capacitance multiplier PCBs designed by Prasi and they cost just pennies at PCBWay.
Hi guys,
I have decided too to join this great project in the 2nd GB so let me join this interesting debate.
Why would someone start a very high-quality project and then destroy it for the sake of saving a few pennies on an essential element? Based on my limited experiences, I can conclude that the use of a capacitance multiplier always improves operation of the amplifier. My all measurements support this conclusion. This is not my opinion, I am talking in terms of measurable facts.
An amplifier, in simplistic terms, basically modulates the available power so why deprive it of the chance for great performance just for slightly lower overall cost. There are some excellent capacitance multiplier PCBs designed by Prasi and they cost just pennies at PCBWay.
Hi Guys,
I thought you all might like a visual reference for the orientation of D115, D116 so I snipped a bit of the PCB.
Now you can see what they look like installed so you can verify your installation.
Please note I have deleted some of the surrounding components for clarity.
I thought you all might like a visual reference for the orientation of D115, D116 so I snipped a bit of the PCB.
Now you can see what they look like installed so you can verify your installation.
Please note I have deleted some of the surrounding components for clarity.
