I believe there is no major mistakes in my schematic. I was thinking about coming up with a simplified version of the buffer, as it seems to work well and Madrigal was using this buffer in most of their other designs.
EL2020 are current buffers. They point the right way.
EL2020 are current buffers. They point the right way.
Peter Daniel said:
Actually I've been thinking and it seams that this is not an option.
A single 1.2v AA battery would do for this (I had around 400mv DC initially), BUT the fine-setting you make with an MT-trimmer will be useless as the battery loses it's charge.
Re: Carlos
Any you can get your hands on.
Morphine's vocalist, sadly disappeared with a (if I remember) stupid bike accident, played bass with only two strings (the middle ones), out of tune.
There was a saxophone. No actually, the guy with the saxophone played two at once, and sometimes with distortion. I've seen this alive, I've never seen anyone playing two saxophones simultaniously.
And the there was a very good drummer.
As you can see, no guitar.
A unique band, only three intruments, very good music, and a sound to for.😎
I am really sorry. (c) Franz😎
Since 5 pm until now, midnight, with only a break for dinner, I've been listening to music.
Compulsively.😀
I've heard things I don't hear for some years.
Advise for anyone that reads this: you must buy and listen to Stanley Clarke "At the movies".
Some years ago I listened to this CD compulsively over and over again. Heard it today, it's compulsive.😀
You will be blown away.
My system has a foot-tapping ability that's really impressive.
If someone that doesn't tap his foot listening to some music I play means that he/she has no legs.
Seriously, another orgasmatic experience (sorry, I have no other word): Talking Heads "Burning down the house".😉
Audiofanatic said:
Any you can get your hands on.
Morphine's vocalist, sadly disappeared with a (if I remember) stupid bike accident, played bass with only two strings (the middle ones), out of tune.
There was a saxophone. No actually, the guy with the saxophone played two at once, and sometimes with distortion. I've seen this alive, I've never seen anyone playing two saxophones simultaniously.
And the there was a very good drummer.
As you can see, no guitar.
A unique band, only three intruments, very good music, and a sound to
for.😎 I am really sorry. (c) Franz😎
Since 5 pm until now, midnight, with only a break for dinner, I've been listening to music.
Compulsively.😀
I've heard things I don't hear for some years.
Advise for anyone that reads this: you must buy and listen to Stanley Clarke "At the movies". Some years ago I listened to this CD compulsively over and over again. Heard it today, it's compulsive.😀
You will be blown away.
My system has a foot-tapping ability that's really impressive.
If someone that doesn't tap his foot listening to some music I play means that he/she has no legs.
Seriously, another orgasmatic experience (sorry, I have no other word): Talking Heads "Burning down the house".😉
CD's
Bom dia Carlos,
Nice said pall 😉
I'll go monday to the best CD shop in Utrecht and hope that Lisbeth can help me with this CD.
Ones again Obrigado 😎
Audiofanatic 😉
I'm going to bed, it's late!
Bom dia Carlos,
Nice said pall 😉
I'll go monday to the best CD shop in Utrecht and hope that Lisbeth can help me with this CD.
Ones again Obrigado 😎
Audiofanatic 😉
I'm going to bed, it's late!
Re: Re: Carlos
Or, maybe, they are or were in an orchestra/band/chamber group where foot-tapping is rather frowned upon. 😉 I mean, can you imagine Barber's Adagio for Strings with the whole string orchestra tapping?
C
carlosfm said:If someone that doesn't tap his foot listening to some music I play means that he/she has no legs.
Or, maybe, they are or were in an orchestra/band/chamber group where foot-tapping is rather frowned upon. 😉 I mean, can you imagine Barber's Adagio for Strings with the whole string orchestra tapping?
C
Re: CD's
Nice said pall 😉
I'll go monday to the best CD shop in Utrecht and hope that Lisbeth can help me with this CD.
What is the best CD shop in Utrecht???
Nice said pall 😉
I'll go monday to the best CD shop in Utrecht and hope that Lisbeth can help me with this CD.
What is the best CD shop in Utrecht???
Re: Re: CD's
Boudisque at the driharingstraat. Ask for Lisbeth or Geert. If you mention my name, (to Lisbeth) you'll get the best service ever and maybe some discount 😀
All the best.
Audiofanatic 😉 (José)
earsandeyes said:Nice said pall 😉
I'll go monday to the best CD shop in Utrecht and hope that Lisbeth can help me with this CD.
What is the best CD shop in Utrecht???
Boudisque at the driharingstraat. Ask for Lisbeth or Geert. If you mention my name, (to Lisbeth) you'll get the best service ever and maybe some discount 😀
All the best.
Audiofanatic 😉 (José)
they do have a lot but... in my experience the people in the classical section will just RUN to anyone over forty wearing a suit. People that
If, otoh, you've just painted your friend's house and you're still wearing your painting clothes (with in your pocket a list of 14 cds you want) you need some pretty good social skills to get them to find the last 2 cds for you.
but that's just my EUR .02 :|
If, otoh, you've just painted your friend's house and you're still wearing your painting clothes (with in your pocket a list of 14 cds you want) you need some pretty good social skills to get them to find the last 2 cds for you.
but that's just my EUR .02 :|
Wrong CD-shop!
Hi Matjans,
You went to the wrong shop. I was talking about the (WERELD MUZIEK) one where the "normal" poeple work 😉
Twee deuren verder!
Now I understand why they call them self Morphine
😀 😀 😀 😀
Audiofanatic 😉
matjans said:
Hi Matjans,
You went to the wrong shop. I was talking about the (WERELD MUZIEK) one where the "normal" poeple work 😉
Twee deuren verder!
carlosfm said:
Now I understand why they call them self Morphine
😀 😀 😀 😀
Audiofanatic 😉
Things improving...but too much gain?
Hi all!
I built the AD815 pre to drive my chipamp (all, pre and chipamp Carlosfm's implementations). First I had a dual 100k pot -way too high...yeah, I know, but faked with a 2k7 resistor- and Carlos adviced me to change for a 10k or 20k log pot.
I did already (10k) and all sonics are greatly improved 🙂 but ....
I was wondering about the best way to reduce gain: is better to reduce in the pre or in the power amp?
I have now lowest volume at 12 o'clock, and I can reach only 15 o'clock before breaking anything (my beloved ears... ie), so only 45º rotation I think is not the ideal setup. I have to mention they are driving very easy and sensitive speakers.
btw, Carlos: have I to measure dc input offset for trimming with the source connected? (newbie attacking again )
and although OT I can't resist: I was trying different speaker cables and I found by accident a very good sounding here. After trying the two coaxial paralleled I disconnected the solid inner copper and connected only the jacket (is a good quality coaxial and the jacket is copper too).... amazing: more transparent, highs silky but clear and bass -indeed- more controled. I remember to read anywhere about ribbon speaker cable, maybe very similar to the copper jacket i have here. Maybe this is not possible with all seakers (???).
Thanks!
JL
Hi all!
I built the AD815 pre to drive my chipamp (all, pre and chipamp Carlosfm's implementations). First I had a dual 100k pot -way too high...yeah, I know, but faked with a 2k7 resistor- and Carlos adviced me to change for a 10k or 20k log pot.
I did already (10k) and all sonics are greatly improved 🙂 but ....
I was wondering about the best way to reduce gain: is better to reduce in the pre or in the power amp?
I have now lowest volume at 12 o'clock, and I can reach only 15 o'clock before breaking anything (my beloved ears... ie), so only 45º rotation I think is not the ideal setup. I have to mention they are driving very easy and sensitive speakers.
btw, Carlos: have I to measure dc input offset for trimming with the source connected? (newbie attacking again
)and although OT I can't resist: I was trying different speaker cables and I found by accident a very good sounding here. After trying the two coaxial paralleled I disconnected the solid inner copper and connected only the jacket (is a good quality coaxial and the jacket is copper too).... amazing: more transparent, highs silky but clear and bass -indeed- more controled. I remember to read anywhere about ribbon speaker cable, maybe very similar to the copper jacket i have here. Maybe this is not possible with all seakers (???).
Thanks!
JL
Hola Juan,
If I remember, you have very sensitive speakers (>95db), indeed you must decrease the gain of the preamp.
I suggest you increase the value of R4 (330R) for 1.2k.
That will give you a gain of 1.5, almost half of what you have (2.87x).
Then adjust dc-offset, with no source connected, volume pot below mid position (10 o'clock is fine).
If I remember, you have very sensitive speakers (>95db), indeed you must decrease the gain of the preamp.
I suggest you increase the value of R4 (330R) for 1.2k.
That will give you a gain of 1.5, almost half of what you have (2.87x).
Then adjust dc-offset, with no source connected, volume pot below mid position (10 o'clock is fine).
carlosfm said:
Thanks Carlos for your fast response (I know you are very busy).
Ok.. for me it's 16 o'clock (I start at 12... various design reasons)... and I'll make all changes. Have I to measure dc offset at input? I think at input, because I remember you mentioned you had between 30 and 100 mv at output depending on pot position.
Really excited about it. This combo rocks!!!
Obrigado
JL
Carlos,
Does this mod affect the sound or just the stability of the regulator? Have you played around with different sizes of transformers for the power supply to the AD815.
Does this mod affect the sound or just the stability of the regulator? Have you played around with different sizes of transformers for the power supply to the AD815.
Dr.H said:
Hi Ryan,
It creates additional PSU filtering (R+C), before injecting the voltage on the NI input.
Sorry if I didn't update the schematic back then.
The thread was forgotten around here and I didn't think somebody would build this. 😱
It's worth the trouble to build this pre, that's for sure!
Dr.H said:
No, I didn't change the trafo, it's not practical, and the one I use just fits very nicely.
My pre has 6 inputs, 3 (buffered) tape loops, two line outputs and dedicated headphone out.
No space for a bigger trafo...
I'm using a small toroid ~500ma at 2x20V that I scavenged from a very old Nokia modem.
The PSU, before the regs, is RCRCC.
carlosfm said:
Hi Carlos
I have 3 questions
What did you use to buffered the tape loops?
How was the "dedicated headphone out" done?
For the AD815 was carbon or metal film resistors used?
The system Im working on now is dual mono. The only things that are shared are the power supply case and power from the wall socket. I would like to use one half of the AD815 for the preamp output and the other half to drive headphone. What do you think?
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