If D2 has a flat side I cant see it, was just the unequal length legs..
I'm 100% certain netiher LED made light before the poof.
Edit; also - C7 has obvious burn sign not visible in the picture.
I'm 100% certain netiher LED made light before the poof.
Edit; also - C7 has obvious burn sign not visible in the picture.
That jumper shouldn’t matter.
-in should have a jumper to the input gnd, but that shouldn’t cause a fatal problem.
Can you post a photo of the bottom of the board?
-in should have a jumper to the input gnd, but that shouldn’t cause a fatal problem.
Can you post a photo of the bottom of the board?
I have 2 models of LED's in sim.
One is HLMP6000 that was in original Patrick's files I play with and second is Cordell's RED.
If i reverse LED with HLMP6000 model, output transistors dissipate 723mW and R11,R12 dissipate 76mW.
If i reverse LED with Cordell's RED model, output transistors dissipate unequal 714mW, 538mW and R11,R12 dissipate 7W.
Those could be error in sim models or it could be that it is possible that with reversed LED R11, R12 will see more than they could handle.
One is HLMP6000 that was in original Patrick's files I play with and second is Cordell's RED.
If i reverse LED with HLMP6000 model, output transistors dissipate 723mW and R11,R12 dissipate 76mW.
If i reverse LED with Cordell's RED model, output transistors dissipate unequal 714mW, 538mW and R11,R12 dissipate 7W.
Those could be error in sim models or it could be that it is possible that with reversed LED R11, R12 will see more than they could handle.
I flow everything twice using a fine tip for the iron. Havent had a cold joint yet...but today is a day of firsts.
The rest of the parts for an M2 just arrived today...was building this to use with that.
One more edit: I also measure everything before it gets stuffed...often twice. Once when it arrives and again before it goes on the board.
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Thanks for the pointers. I have to assemble my VRDN, then I'll be able to test it out.
I saw someone say a while back that it's comparable to the XP-20. Which I have, so I'll be interested to compare them.
6L6 called it, my LEDs were backwards.
The following things are also true: haste makes waste, and 6L6 is both a gentleman and a scholar. For many reasons.
@6L6 - Many thanks for all the help, over the years! I am in your debt. The sweet tunes that pour forth in our house almost daily are due both to your significant contributions, and those who originated the circuits. It truly takes a village.
🙂
The following things are also true: haste makes waste, and 6L6 is both a gentleman and a scholar. For many reasons.
@6L6 - Many thanks for all the help, over the years! I am in your debt. The sweet tunes that pour forth in our house almost daily are due both to your significant contributions, and those who originated the circuits. It truly takes a village.
🙂
I want to improve the sound from a 4-channel integrated amplifier I made using a Hypex UDC34MP digital amplifier board. I am currently using two NE5534 Pre-Amplifier boards. The preamplifier boards from Yuan Jing have the volume knob on the board. How does the volume get controlled with the Linestage amp?
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The volume is controlled on the input. So the signal goes from the input to the volume knob, then to the linestage. Just a simple + - and ground. The ground and the negative get tied together for single end connections. You need two boards if you want to do balanced. The linestage has output soldering pads on it. I believe the kit from DIYaudio comes with connectors that get soldered onto the boards. It's been a while since I have ordered one.
It is my favorite linestage but be wary of the SMD JFETs if you haven't played around with those before. Order the appropriate stuff for soldering those on like liquid flux and a soldering gun that you can control the temp on.
It is my favorite linestage but be wary of the SMD JFETs if you haven't played around with those before. Order the appropriate stuff for soldering those on like liquid flux and a soldering gun that you can control the temp on.
Thanks Mike. Following the traces on the boards from Yuan Jing that is how the volume is controlled also. 👍
I bought wayne BA 2018 linestage and am looking for the power supply. I believe the dual / bipolar LV-Reg GlassWare is OK. I would like to power the linestage with 18V. Could a transformer with double output 15v ac 100mA be good?
I used Gaz's power supply. Here is a link to it:
https://www.audiosy.net/2021/01/21/meet-helios-bi-polar-power-supply-rev-b-boards-coming-soon/
It is a nice power supply.
The Glassware stuff is pretty nice as well. I used one on a BA3 Preamp and it worked really well. I believe the 15vac transformer should work fine for the 18v regulator. The boards that Glassware sends are very impressive. Make sure you pay good attention to getting the diodes in their proper orientation. I accidentally put one backward. Nothing terrible happened. Just took me a bit to figure out why the voltage output wasn't right. I used an Antek transformer.
https://www.audiosy.net/2021/01/21/meet-helios-bi-polar-power-supply-rev-b-boards-coming-soon/
It is a nice power supply.
The Glassware stuff is pretty nice as well. I used one on a BA3 Preamp and it worked really well. I believe the 15vac transformer should work fine for the 18v regulator. The boards that Glassware sends are very impressive. Make sure you pay good attention to getting the diodes in their proper orientation. I accidentally put one backward. Nothing terrible happened. Just took me a bit to figure out why the voltage output wasn't right. I used an Antek transformer.
Yesterday I began to solder most part of the resistors.
At the end I got tired and soldered wrong value resistors.
Clumsy desolder with a desolder wick and I damaged a small part of the trace mask near R29 pad.
Not scary, but I know where this cosmetic imperfection and see it right away.. 😵
At the end I got tired and soldered wrong value resistors.
Clumsy desolder with a desolder wick and I damaged a small part of the trace mask near R29 pad.
Not scary, but I know where this cosmetic imperfection and see it right away.. 😵
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Hello Waynes linestage-builders,
I have put my WLS - variant3 and the PSU into some cases. Am I allowed to call it WLS? 🤔
It is a variant. Same circuit as Waynes linestage - different active devices.
JFets 2SK2394-6-TB-E Onsemi (very low noise), 2N5551/2N5401 and Fairchild Mosfets FQP3N30/FQP3P20.
It is a dual - mono - build.
It sounds very detailed and clear. I like it. But I am still testing. Not a lot of time for listening at the moment.
The PSU got a very long case (350mm) - thanks to Modushop / Gianluca. It`s also dual mono.
The outputvoltage is adjustable up to +-22V DC. Adjusted to +-20 V DC.
Measured ripple without load was around 0.4 mV.
Cheers
Dirk
I have put my WLS - variant3 and the PSU into some cases. Am I allowed to call it WLS? 🤔
It is a variant. Same circuit as Waynes linestage - different active devices.
JFets 2SK2394-6-TB-E Onsemi (very low noise), 2N5551/2N5401 and Fairchild Mosfets FQP3N30/FQP3P20.
It is a dual - mono - build.
It sounds very detailed and clear. I like it. But I am still testing. Not a lot of time for listening at the moment.
The PSU got a very long case (350mm) - thanks to Modushop / Gianluca. It`s also dual mono.
The outputvoltage is adjustable up to +-22V DC. Adjusted to +-20 V DC.
Measured ripple without load was around 0.4 mV.
Cheers
Dirk
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There actually are three self contained PS you can use. Besides the one previously mentioned designed by Gaz, the Helios, there's one designed by avdesignguru, post 2696 this forum and Pete Millett makes one that works well (http://www.pmillett.com/LR_phono.html) which he designed as part of a phono preamp. Avdesignguru's uses traditional 78xx&79xx regulators (so you can get fancy and put in Sparkos regulators if you want) while the other two PS use 2941&2991 adjustable regulators. I've tried all three with BA2018 builds and all work well. Pete's is the smallest in dimension of the three.
You can also choose to use a traditional linear PS circuit that feeds either a Super-Reg or a Salas Ultra BiB shunt regulator to power the 2018.
Cheers,
Pete