A Group Buy is just what it says. Someone has developed something of use for others. Interest is pooled so prices can be lower, and at a certain point stuff is ordered and shipped.
If you look into the Group Buy section (see menu 'Commercial sector' at the bottom on left side of your diyaudio Home screen: https://www.diyaudio.com/forums/group-buys/ ) you will see lots of varied Group Buys, some finished, some still active, some even restart several times.
As happens a lot, also in the case of my high-voltage regulator, after the Group Buy it sort of peters out but now and then people want one or two and I always have stuff for a dozen or so in stock.
Jan
If you look into the Group Buy section (see menu 'Commercial sector' at the bottom on left side of your diyaudio Home screen: https://www.diyaudio.com/forums/group-buys/ ) you will see lots of varied Group Buys, some finished, some still active, some even restart several times.
As happens a lot, also in the case of my high-voltage regulator, after the Group Buy it sort of peters out but now and then people want one or two and I always have stuff for a dozen or so in stock.
Jan
Sorry for the delay. I have CoronaVirus and I have been in ill since last week. I plan to use this regulator in the pre-amp section of one of my amps. How can I purchase your regulator from you?
Mark
Mark
Update July 2020: All good things will come to and end!
I have decided that I will stop providing T-reg 'half kits' when my current stock is depleted. It was a nice ride but it takes too much of my time, I have other ideas I want to pursue. As of this date (17 July) I have 10 units left. Thanks for all your interest and comments!
Jan
I have decided that I will stop providing T-reg 'half kits' when my current stock is depleted. It was a nice ride but it takes too much of my time, I have other ideas I want to pursue. As of this date (17 July) I have 10 units left. Thanks for all your interest and comments!
Jan
Will bare boards still be available in the future? I still have a couple of the kits that will soon find homes in my amps, but it would be great to have boards available for future projects.
cheers and thanks, Derek
cheers and thanks, Derek
Jan,
Do consider offering it through the DIYAUDIO store as you have done with your HV delay board and Silent Switcher.
My very best,
Anand.
Do consider offering it through the DIYAUDIO store as you have done with your HV delay board and Silent Switcher.
My very best,
Anand.
That's an idea. I'll check with Jason if he is interested.
I don't need to make any money from it.
Jan
I don't need to make any money from it.
Jan
Reducing output noise
I have a few questions about the output noise of the reg. The plot on Jan's Linear Audio website http://linearaudio.nl/sites/linearaudio.net/files/Noise%20small.jpg appears to show strong harmonic structure to the largest magnitude noise, with a 100Hz fundamental. Is this just residual ripple passed through by the reg? In which case, very low ripple at the input should result in decreased noise at the output?
If that's not the case, and the output noise profile is intrinsic to the reg itself, is there a simple way of reducing it after the output? I appreciate that 300 uV is quite low, but I'm interested in playing around with the PSU to get as close to a pure DC supply as possible - just to see/hear for myself. I'm still quite new to the hobby, and have no EE education, so I'm hoping for some guidance. My thought was to add an additional LC filter stage after the reg. Does anyone see a problem with this? Are there other suggestions?
I realize that if I add an LC filter after the reg, I'll need to adjust the Vout setting to account for the additional voltage drop. I can manage that ok.
cheers and thanks, Derek
I have a few questions about the output noise of the reg. The plot on Jan's Linear Audio website http://linearaudio.nl/sites/linearaudio.net/files/Noise%20small.jpg appears to show strong harmonic structure to the largest magnitude noise, with a 100Hz fundamental. Is this just residual ripple passed through by the reg? In which case, very low ripple at the input should result in decreased noise at the output?
If that's not the case, and the output noise profile is intrinsic to the reg itself, is there a simple way of reducing it after the output? I appreciate that 300 uV is quite low, but I'm interested in playing around with the PSU to get as close to a pure DC supply as possible - just to see/hear for myself. I'm still quite new to the hobby, and have no EE education, so I'm hoping for some guidance. My thought was to add an additional LC filter stage after the reg. Does anyone see a problem with this? Are there other suggestions?
I realize that if I add an LC filter after the reg, I'll need to adjust the Vout setting to account for the additional voltage drop. I can manage that ok.
cheers and thanks, Derek
Derek, good points. But I must point out that these graphs are from a very early version of T-reg, with a much different topology than the current version which has seen lots of small improvements over several years.
Unfortunately I do not have a comparable graph for the latest version.
To your question: if there is too much mains noise at the output (that's what these 100Hz spurs are, rectified 50Hz mains in Europe), they should be attacked at the input side of the regulator. Sometimes people use extra LC-filters between the rectifier and regulator input, or even a pre-regulator in that position.
Trying to fix it at the regulator output is likely to worsen the overall performance.
Jan
Unfortunately I do not have a comparable graph for the latest version.
To your question: if there is too much mains noise at the output (that's what these 100Hz spurs are, rectified 50Hz mains in Europe), they should be attacked at the input side of the regulator. Sometimes people use extra LC-filters between the rectifier and regulator input, or even a pre-regulator in that position.
Trying to fix it at the regulator output is likely to worsen the overall performance.
Jan
Excellent! Many thanks Jan. Minimizing ripple at the input is not a problem.
much appreciated, Derek
much appreciated, Derek
If you add an LC filter "After the Reg" you will increase its output impedance. Suggest placing it before the T-Reg.
Thanks jackinnj - Hadn't even considered that. I was only thinking of adding an LC after the reg if the reg was generating the bulk of the harmonic noise. But since Jan has advised the higher amplitude harmonic noise is post-rectifier ripple, I don;t think I'll need to worry about post-reg filtering. My PSUD modeled CLCLC filter should knock down ripple before the reg to well under 50 uV. I'll be more than happy with that.
cheers, Derek
cheers, Derek
Need current limit instructions for TS-3 version
Can someone please post or PM me a copy of Jan's instructions for setting the current limit on the TS-3 version of the board?
As best as I can see, the instructions posted on Linear Audio are only for the revised V4 board that has uses a single resistor R16 to set the current limit. There's no R16 on my version of the board.
many thanks, Derek
Can someone please post or PM me a copy of Jan's instructions for setting the current limit on the TS-3 version of the board?
As best as I can see, the instructions posted on Linear Audio are only for the revised V4 board that has uses a single resistor R16 to set the current limit. There's no R16 on my version of the board.
many thanks, Derek
On the V3 board, you set the current limit with the value of R6. Example: current limit 200mA, R6 = 0.6V/0.2A = 3ohms.
Then you set R8 to about 1/3rd or 1/4th of that value. In this example, R6 = 3 ohm, R8 = 1 ohms or 0.75 ohm.
This is not critical, you can select nearest practical values.
To make it a bit easier, these two resistors are fixed on the V4 board with a single resistor in parallel to set the current limit.
Jan
Then you set R8 to about 1/3rd or 1/4th of that value. In this example, R6 = 3 ohm, R8 = 1 ohms or 0.75 ohm.
This is not critical, you can select nearest practical values.
To make it a bit easier, these two resistors are fixed on the V4 board with a single resistor in parallel to set the current limit.
Jan
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Replacement for BC560 PNP?
Sorry to be a pest, but Mouser lists the BC560C as obsolete.
Is the ON Semi BC327 a suitable replacement? I attach datasheets for both.
It looks equivalent to my newbie eyes. However, the BC560C is described as "low noise" and includes noise data. The BC327 datasheet does not mention noise.
Many thanks, Derek
Sorry to be a pest, but Mouser lists the BC560C as obsolete.
Is the ON Semi BC327 a suitable replacement? I attach datasheets for both.
It looks equivalent to my newbie eyes. However, the BC560C is described as "low noise" and includes noise data. The BC327 datasheet does not mention noise.
Many thanks, Derek
Yeah that's fine. Those transistor are used as switches, either in the current limiting or as a discrete triac for shut-down. Any reasonable high Hfe (>100) small-signal transistor will work here.
The BC556B or C series are also good.
Jan
The BC556B or C series are also good.
Jan