Just a bit of information on these boards, the grounds on the two channels are not connected. This offers some grounding options one is to install a jumper by P1 that connects the grounds with two small pads this would work well if building each board balanced.
Wayne,
since i have some sk117, sa970 and sc2240 (all bl) in my drawer -
would you advice against using them in this circuit?
regards
A.
since i have some sk117, sa970 and sc2240 (all bl) in my drawer -
would you advice against using them in this circuit?
regards
A.
I successfully got boards and some keratherm in cart and purchased, but the discount code you had given me a while back wouldn't work. I went ahead with purchase for fear they would sell out, and sent an email in regard.
Likely some user error on my end, glad to see these boards make it to store.
Russellc
I look forward to seeing them in the mailbox.
Did I read somewhere that the warehouse is in MA?
Time for a dumpster dive?
🙂
Did I read somewhere that the warehouse is in MA?
Time for a dumpster dive?
🙂
Please contact the store helpdesk (contact@diyaudiostore.com) regards that.
About 2 years ago we moved logistics (storage and shipping) from using a large 3PL in PA (3rd Party Logistics service) where we were just a number (Shipwire) to a friendly family owned and run 3PL in MA where they know us by name (Sprocket Express). We've been happy with the move. They suit the hobbyist / micro-business nature of the store and idiosyncrasies associated with making small batches of kits and resolving issues that arise (read: flexibility to help with fixing problems!). But also they have the staff and capacity to ship out hundreds of orders in a day when stock of a pre-order or in demand item comes back in stock without breaking a sweat. So best of both worlds.
This PCB was delayed due to multiple factors including myself, C19 related PCB manufacturing and shipping delays and then packaging delays. Glad it's finally available 🙂
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Thanks all for taking the time.
I have a pair of purples that I built up. I am not happy how the smt gets came out. this was back when I was seeing two of everything - thanks to lifestyle changes and big pharma miracles much better now! Please take care of yourselves fellow diyers.
Probably will take another year, but I look forward to hearing this line stage.
I have a pair of purples that I built up. I am not happy how the smt gets came out. this was back when I was seeing two of everything - thanks to lifestyle changes and big pharma miracles much better now! Please take care of yourselves fellow diyers.
Probably will take another year, but I look forward to hearing this line stage.
Power Supply Question
Ordered the board components yesterday from Digikey (Mouser is out of stock for the forseeable future on the KSC1845) so my mind has turned to a power supply for this project.
Obviously a Whammy-style PS would be ideal but since I will not be using it to drive headphones, I'm thinking a 36V SMPS with a TLE2426 precision rail splitter. Watching the BA video and looking at the slides, it looks like this circuit draws around 15mA, well within the 20mA limit of the rail splitter.
Am I missing something here? I can always build it up and measure the current but no sense doing that if someone already knows the current draw into a 10K or higher impedance load.
I ordered the alternate output transistors as well but not sure if they are necessary if this is only a preamp.
Ordered the board components yesterday from Digikey (Mouser is out of stock for the forseeable future on the KSC1845) so my mind has turned to a power supply for this project.
Obviously a Whammy-style PS would be ideal but since I will not be using it to drive headphones, I'm thinking a 36V SMPS with a TLE2426 precision rail splitter. Watching the BA video and looking at the slides, it looks like this circuit draws around 15mA, well within the 20mA limit of the rail splitter.
Am I missing something here? I can always build it up and measure the current but no sense doing that if someone already knows the current draw into a 10K or higher impedance load.
I ordered the alternate output transistors as well but not sure if they are necessary if this is only a preamp.
I already have the PSUs on the way. 🙂 And based on my own scope measurements on the single rail PSU. It will be just as quiet. 😀
Attachments
I see R15 has been reduced from 100K to 47K on the new boards. Any reason for the change. Doubles the current in the first follower stage. Did it change the sound, or performance in some way?
It does double the current but the distortion stays about the same. The current was a bit low compared to the input stage and that may be unusual but it works fine anyway. Mark Johnson noticed this before my presentation at BA 2018 and this seems like a good compromise. Feel free to play around with the value if you want just watch the power dissipation.
Gaz2613:
Is your power supply designed for both 115 and 230 VAC, and will you be offering a group buy? Oh, and what's the size of the pcb?
Regards,
Scott
Is your power supply designed for both 115 and 230 VAC, and will you be offering a group buy? Oh, and what's the size of the pcb?
Regards,
Scott
Hi Scott yes the board supports both voltage inputs but you must configure it for the required voltage using jumper wires just like on the whammy. The board size is 218mm x 94mm.
I can organise a group buy once numbers are known as I will put an order in for more boards to be made.
Regards
Gareth
You don't need a load to measure the ripple. The measurements are taken before the regulator to demonstrate the smoothing effect of each cap.