2N2222A phono preamp - Page 5 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st February 2010, 05:30 PM   #41
Obe1 is offline Obe1  United States
diyAudio Member
 
Join Date: Jan 2010
Location: Stumptown
Default 2N2222A phono preamp grounding scheme

Hello Ivey,

Thank you! This is very nice.

Please suggest a grounding scheme for your 2N2222A circuit and power supply. I ask because most turntables I've seen have a separate ground wire that was attached to the back of the preamp on a dedicated grounding screw/lug and I was never sure how this all fit in to the big picture.

Best regards,

Obe1
  Reply With Quote
Old 1st February 2010, 06:58 PM   #42
diyAudio Member
 
Join Date: Apr 2008
hi, i've tried to sim it, but the curve i've got is FAR from RIAA-spec..

included is de updated .dio lib for the zener and de .asc for LTspice
Attached Files
File Type: zip 2n2222a phono.zip (1.1 KB, 125 views)
File Type: zip standard.zip (4.3 KB, 81 views)
  Reply With Quote
Old 1st February 2010, 07:26 PM   #43
AKN is offline AKN  Sweden
No snake oil
diyAudio Member
 
AKN's Avatar
 
Join Date: Aug 2005
Location: In the middle of Sweden
Send a message via MSN to AKN
Hi,

Change C3 (in your sim) from 1uF to 1.5nF.

Edit: You'll find my source here: http://www.diyaudio.com/forums/analo...ml#post2050332
__________________
/ Anders

Last edited by AKN; 1st February 2010 at 07:48 PM.
  Reply With Quote
Old 1st February 2010, 07:43 PM   #44
diyAudio Member
 
Join Date: Apr 2008
Quote:
Originally Posted by 4fun View Post
Hi,

Change C3 (in your sim) from 1uF to 1.5nF.


much better, thank you

desired:
Click the image to open in full size.

and simulated in attachment

20Hz is -2.75dB off, 1KHz is 1.31dB off, 20KHz is -4.4dB off. (source is 9mV)

pretty respectable, but clearly some room for improvement. i'll breadboard it first
Attached Images
File Type: png measured.PNG (17.5 KB, 756 views)
  Reply With Quote
Old 2nd February 2010, 01:17 PM   #45
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default I am Sorry Gentlemen:

I was away on another forum, but I am back now.

I am building the phono preamp for two others, and I came across a site that sales JAN2N2222A transistors at $00.45 cent ea. It is called

Surplus-Electronics-Sales.Com

Yes, the design of the Phono PreAmp can be improved in all areas. That is why I posted it. Now, it belongs to all of you guys. To use it as is, or to mod it as you see fit.

I have done many changes to this design in the past. By changing the input transistor with a more sensitive one, like the BC107. I have replaced all the transistors with 2N4401's and even used very hi end parts. And the results were good to outstanding.

The idea of this thread is to build a simple, yet effective phono preamp, with easy available parts, and do it at low low cost. PLus, later on, add the tonal circuit and line circuit with the same scheme in mind. Then, place it all in this jazzy case design I am cooking up. And have this beautiful piece of hifi gear to use, keep, or trade.

We must remember that there are better transistors out there other than the 2N2222A. But the 2N2222A is a very useful transistor.

Like most of us, the 2N2222A is old, but reliable.

We have all looked at the data sheet of a 2N2222A, but have you ever really, really studied it and compared it to other transistors. You will find out that you can get by without so many transistors that you may have today. And save a small sum of money.

Keep in mind, that at low small signal levels, the 2N2222A does a great job. And with a maximum noise level of 4db, it is more silent than even the BC107. But it's high speed switching and high ft, is also useful.

I found it to be a better chopper and switcher than those transistors designed for those purposes.

To me, the 2N2222A is like chicken. Everything taste like chicken. And finger lick-in good.

But truly it is all up to you. What ever it is that you want to do.

Happy Trails guys.

And I will post the second half of the preamp, the tone control-line amp circuit before I attend by son's third wedding.

He is still searching for a girl like his mother. No clue that kid. No clue.

Take Care

Ivey

Last edited by Ivey; 2nd February 2010 at 01:23 PM. Reason: grammar
  Reply With Quote
Old 2nd February 2010, 03:06 PM   #46
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
i don t understand why people still stick with these kinds
of circuits, moreover , using inadequate transistors...
with about an EIN of 13 nV/sqrt hz noise, although decent for
the 60 s , it s well over any very cheap opamp..
a NE5532, which is a 30 years old circuit, has 4.5 nV/sqrt hz,
about 12 db less noise...
  Reply With Quote
Old 3rd February 2010, 01:59 AM   #47
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default Wahab:

Because they are easy to play with.

You can mod them such easier than opamps.

Opamp's are made up of 12 to 15 transistors, resistors, and caps. You can not change the insides character of an Opamp, you must settle with what ever the Opamp brings to the table.

You can only change the supporting components, with the transistor, you can change everything, and start over if you like. With the Opamp, you can not.

With the transistor circuit, you have total control of the product and the way it will sound.

Take Care


Ivey
  Reply With Quote
Old 3rd February 2010, 02:10 AM   #48
Obe1 is offline Obe1  United States
diyAudio Member
 
Join Date: Jan 2010
Location: Stumptown
Hello Ivey,

Looking forward to you promised line stage design and chassis / enclosure concepts.

Best regards,

Obe1
  Reply With Quote
Old 3rd February 2010, 10:42 PM   #49
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
Quote:
Originally Posted by Ivey View Post
Because they are easy to play with.

You can mod them such easier than opamps.

Opamp's are made up of 12 to 15 transistors, resistors, and caps. You can not change the insides character of an Opamp, you must settle with what ever the Opamp brings to the table.

You can only change the supporting components, with the transistor, you can change everything, and start over if you like. With the Opamp, you can not.

With the transistor circuit, you have total control of the product and the way it will sound.

Take Care


Ivey

100% agree...and this one need some tweaks...
with the values used, biases are inadequates, as the negative going
of the signal can t pass about 2.5V peak , due to the second stage having
a high emitter voltage...
it result that clipping is extremely unsymetrical...
  Reply With Quote
Old 3rd February 2010, 11:08 PM   #50
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default Wahab:

Right on>

Ok, fix it. Get it to perform the way you feel it would be a better mouse trap. And share it with us. Show us how you would do it. And we can learn something from you. And add it to the things that we already know.

There are many ways to cook chicken. So I am asking you to share your favorite recipes with the rest of us.

This is a forum for fun and learning. We all can use some education.

I showed you my way, now I ask you to show me yours.

I wait your reply, my friend.

Take Care

Ivey
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2N2222A transistor and transisitor history ncdrawl Parts 119 19th February 2010 10:28 PM
new phono stage or old preamp with phono? flohmann Analog Line Level 2 2nd October 2008 09:51 PM
phono preamp wombil Solid State 5 21st May 2008 11:59 AM
Electret mic preamp - will phono preamp work? darthmullet Analogue Source 6 12th October 2007 07:32 AM
Phono PreAmp JTT Analogue Source 20 15th September 2004 04:24 PM


New To Site? Need Help?

All times are GMT. The time now is 09:06 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2