|
|
Post by clausdk on Aug 24, 2010 22:23:33 GMT
Hi Frans mine has not arrived yet, but as you probably know it has not been on the way for very long time yet, I will contact you when it does arrive.. You may not run a charity, but you are very generous..  |
|
|
|
Post by clausdk on Aug 24, 2010 22:26:14 GMT
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Aug 25, 2010 0:04:47 GMT
Jon
If you are short of boards let me know and I can return some. I over-ordered to support you in the early days so I'll never use all I have.
Syd
|
|
jonclancy
Been here a while! 
Mr. Ripple Eater
Amateur EAGLEist
Posts: 1,131
|
Post by jonclancy on Aug 25, 2010 23:30:37 GMT
Hi Syd, That's very generous, thanks!!  I've sorted out Nicola with the four boards I was having. No sweat as I have the test pair and also a set of hand-etched, single-sided pre-proto from the last order. The good news is that I now have my PayPal account back, and the dough is coming out as we speak. Hopefully wrap this GB up soon, as I have a workstorm approaching!  I also got my square 3/4" punch today, and am looking dangerously at a chassis I have in stock. Should be fun!!! Cheers Jon |
|
|
|
Post by sondale on Sept 7, 2010 22:34:54 GMT
Jon If you are short of boards let me know and I can return some. I over-ordered to support you in the early days so I'll never use all I have. Syd Syd, My first post on this forum and it is to ask if you still want to(or are willing to) get rid of some of the boards  . I am looking for 4 of them. Puffin has kindly let me have a couple of boards / parts which are built for 15volts, however I want to put a couple into my Pass Pearl phono which is 30+ volts. Alan |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Sept 7, 2010 22:50:24 GMT
Jon If you are short of boards let me know and I can return some. I over-ordered to support you in the early days so I'll never use all I have. Syd Syd, My first post on this forum and it is to ask if you still want to(or are willing to) get rid of some of the boards . I am looking for 4 of them. Puffin has kindly let me have a couple of boards / parts which are built for 15volts, however I want to put a couple into my Pass Pearl phono which is 30+ volts. Alan Alan xtrprof ( Chong) may be willing to part with a few of his, as he bought them mainly to support Cancer Research in honour of Rick Creamer. Don't forget that at >30V that you will need to have the current limiter in situ, and use more suitable emitter and base resistor values for the Current Limiter transistor. Go by the chart given by JLH in the original schematic. Alex |
|
|
|
Post by PinkFloyd on Sept 7, 2010 23:16:54 GMT
I have four boards going spare (I'm never going to use them) PM me, first come first served.
Mike.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Sept 7, 2010 23:29:17 GMT
Hi Alan I see Mike's beaten me to it! He never sleeps Regards Syd |
|
|
|
Post by sondale on Sept 8, 2010 7:52:49 GMT
I have four boards going spare (I'm never going to use them) PM me, first come first served. Mike. PM sent for all four. Alan |
|
jonclancy
Been here a while!
Mr. Ripple Eater
Amateur EAGLEist
Posts: 1,131
|
Post by jonclancy on Sept 14, 2010 9:10:50 GMT
More boards will be available soon. Alan Elsdon is doing the legwork for a second batch. Over at DIYA in the GB forum. Much the same as before - different charideeeeeee.
Jon
|
|
|
|
Post by andrewinukm on Sept 20, 2010 9:30:02 GMT
Pardon my noob-ness... 1. How much voltage and current can the JLH Ripple Eater pass through? (The manual mentioned that this is a low current version for 500mA.) I intend to use it for a T-amp ( link) with output of 15W (8Ω, 10% THD+N), 10W (8Ω, 10% THD+N), with recommended power supply of 12V 3A. A recommended SMPS by lowyat.net is the Meanwell RS-50-12 ( link), which can output 11~13V 4.2A. I'm thinking of putting the JLH Ripple Eater between the SMPS and the T-amp. -Do I just remove the current limiter and be done with it? Or are there any modifications needed? -Do I need a linear voltage regulator (Tangent TREAD? Sigma11?) for the SMPS output? -------------------- 2. I also intend to use it as an add on to Playstation 1's modded PSU ( Mick Feuerbacher's PSU mod).  There are 2 power supplies: each voltage supply & current draw is 7.6V 1A, & 3.6V 500mA. -I assume for 3.6v 500mA line: no modification needed for the JLH... Am I correct? -7.6V 1A line is for the motor of the CD transport and motor of PS1. Would it be pointless to add a JLH to this line? (Does a motor actually need such a clean power supply? ) |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Sept 20, 2010 10:10:06 GMT
I am using a different version PCB with a 12V 2A supply using the MC78T12 voltage regulator without any problems.
The Current Limiter section has been bypassed.
However, you need to remember that John Linsley Hood only designed this circuit to work up to 300mA.
Despite stating that in the original article, the chart only showed the values for working up to 100 mA !
Personally, I would never consider doing that. A typical SMPS will have a lot of HF ripple, and may even resent the very high initial startup current drawn by the JLH. Also, normal voltage regulators are not very effective at eliminating HF ripple from a SMPS. although a choke at the input to the linear voltage regulator, followed by another capacitor at the input to the regulator will often assist.
The original JLH circuit was mainly designed to work with 50/100HZ ripple from normal linear power supplies.
You are going into uncharted territory here !
There should be no problems when using it with the +7.6V 8.3V regulated circuits as shown.
The Current Limiter section will need to be bypassed.
I see no advantage to using it with a supply for a motor.
The JLH will be relatively ineffective at +3.6V, although it may make a minor improvement.
|
|
jonclancy
Been here a while!
Mr. Ripple Eater
Amateur EAGLEist
Posts: 1,131
|
Post by jonclancy on Sept 20, 2010 22:34:27 GMT
Puffin has kindly let me have a couple of boards / parts which are built for 15volts, however I want to put a couple into my Pass Pearl phono which is 30+ volts. Alan So do I! Allan Pagan has a schema for up to 55V. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Sept 20, 2010 22:58:44 GMT
Puffin has kindly let me have a couple of boards / parts which are built for 15volts, however I want to put a couple into my Pass Pearl phono which is 30+ volts. Alan So do I! Allan Pagan has a schema for up to 55V. Jon Go for it using the Current Limiter at a more modest current limit setting. The BC550C and BC560C are rated for 45V. Most of the available 1 to 2.2uF caps will be 63V or a minimum of 50V. Just increase the voltage ratings of the 10uF and 100uF electros. Alex |
|
|
|
Post by arjen on May 29, 2011 10:27:33 GMT
The version of 15V works as expected, and the manual only refers to this voltage. I would like to make a version of +35V. When using + 18V as input voltage Q6 of the current limiting section already get quite hot. Apart from the use of transistors and capacitors that can handle this voltage, are there any other adaptions to be made for higher voltages, for instance, in values of resistors?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 29, 2011 11:12:34 GMT
The version of 15V works as expected, and the manual only refers to this voltage. I would like to make a version of +35V. When using + 18V as input voltage Q6 of the current limiting section already get quite hot. Apart from the use of transistors and capacitors that can handle this voltage, are there any other adaptions to be made for higher voltages, for instance, in values of resistors? arjen How much current are you drawing when the CL transistor gets quite warm ? Several RG members have used them at +-20V at >200mA per rail without excessive warming, although now, due to using dual JLHs instead , they are only doing a little over 100mA per rail. When using at +35V you will need to fit a small heatsink to the CL's 2SA1930 , and markedly increase the CL emitter resistor value, otherwise the ratings of the CL device will be greatly exceeded at start up.The original design by JLH did not even give component values for higher than 100mA. At +35V you will still be able to use BC550C in the differential pair. I would also try changing the 10K to 22K Alex . Attachments:
|
|
|
|
Post by arjen on May 29, 2011 12:46:24 GMT
Alex,
Thank you for your kind suggestions and the 55V-schematic that I previously already rearched for. I can proceed now with experimenting.
Arjen.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jun 12, 2015 0:07:16 GMT
I have found that when using 2 x low ESR caps in parallel, due to their very low Z at 100kHZ, that they can tend to make upper treble sound a little too etched, and ultimately fatigueing.
Best tonal balance with many different types of equipment, whether DACs, preamps, or even for the front end of Class A amplifiers, and with external +5V Linear PSUs for USB memory sticks, is when using a low ESR type in parallel with a normal type electro of the same capacitance. If your gear is slightly lacking at HF, use of 2 parallel low ESR types may help to compensate a little though.Also, if you are using the JLH at +5V or +3.3V , a further improvement at these low voltages will be obtained by replacing the 10K resistor with a Current Regulating Diode of around 1.5mA. A J506 is suitable.Alternatively a selected FET such as the 2N5484 with Gate and Source tied may be used.
At voltages higher than 20V without the Current Limiter in use, a small heatsink should be fitted to the 2SC5171/2SA1930 with the 33 ohm emitter resistor.
The JLH with the CL section bypassed, and supplied by a 3A voltage regulator such as the MC78T05 or MC78T12 will work at up to 2Amps, but input and output leads should preferably be 10A rated to reduce voltage drops. If several mV drop across the Earth and Supply rail tracks is a problem, then they can be supplemented with tinned copper wire under the PCB.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jun 23, 2015 8:18:54 GMT
JLH PSU Add-on R.G. Version (Updated.)
For -VE rail version, make changes as in previous post.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 3, 2015 5:38:41 GMT
|
|
jc
Fully Modded
Posts: 5,417 
|
Post by jc on Oct 3, 2015 14:11:37 GMT
I note that the sanyo offerings have a much higher quoted hfe range which makes them more desireable? I can't see anything else apart from the second €bay link does not state that they are actually sanyo originals, if that matters.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 3, 2015 20:58:02 GMT
I note that the sanyo offerings have a much higher quoted hfe range which makes them more desireable? I can't see anything else apart from the second €bay link does not state that they are actually sanyo originals, if that matters. Hi Chris Many of my more recent 2SC5171 are lower HFE, so the much higher HFE and higher bandwidth may be a further advantage ? Let's see what Bill thinks about these. I have ordered a batch of 30 of the 2SC5707, as at the low asking price I have very little to lose. The labelling on the others does appear to be similar to the Sanyo devices though. As I originally got equal numbers of both types, and we use far more of the 2SC5171, I still have quite a few O.K. 2SA1930 left.
Kind Regards Alex
|
|
jc
Fully Modded
Posts: 5,417
|
Post by jc on Oct 3, 2015 21:15:58 GMT
I agree, my last batch of Toshes were musch lower as well, my best matching set were around 190hfe and the Sanyos start at 200! Let us know how they go.
Will you be using them in JLH PSRRs for testing?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 3, 2015 22:38:45 GMT
I agree, my last batch of Toshes were musch lower as well, my best matching set were around 190hfe and the Sanyos start at 200! Let us know how they go. Will you be using them in JLH PSRRs for testing? Hi Chris I will try making a single JLH and see how it goes in an existing USB PSU for the Oppo 103
Regards Alex
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 23, 2015 3:45:02 GMT
I now have a single Red coloured JLH PCB completed from Chris's recent Group Buy, and I am putting some hours on it using my bench PSU to form the 2 x 4,700uF electrolytic capacitors before trying it in a USB Power supply. Instead of the harder to get Toshiba 2SC5171, which have recently appeared to generally have lower HFE than previously, I installed the TINY 2SC5707 which have higher HFE and Ft as well. They are quite cheap on ebay at present , so I purchased a batch of 30. The first one that I tested had a rather low HFE of just over 100, but the next 5 or 6 that I tested all had an HFE between 230 and 280.
Alex
|
|
. I am looking for 4 of them. Puffin has kindly let me have a couple of boards / parts which are built for 15volts, however I want to put a couple into my Pass Pearl phono which is 30+ volts.
