MM phono preamp with accu and solarcells - 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 8th September 2012, 08:21 PM   #1
Koifarm is offline Koifarm  Netherlands
diyAudio Member
 
Koifarm's Avatar
 
Join Date: Aug 2005
Default MM phono preamp with accu and solarcells

Introduction

For some time i want to build a phono pre and last winter i started with a basic schematic. I liked the sound of it but i needed another powersupply. I used two 9v accu and solarcells.Further would it be easy if i can adjust the impedance, capaciticy and amplification of the circuit.

Schematic

Click the image to open in full size.

The schematic shows one channel and the power supply.
For IC1 you can use LM4562, LME49720, NE5532, OP275, AD827, 2 x OPA627 in dual adapter.

The PCB

Click the image to open in full size.

Click the image to open in full size.

For pcb design on film see link below.

http://www.monstercore.nl/phono3%20-%20PCB.pdf

Click the image to open in full size.

The housing with solarcells.

Adjustments

Click the image to open in full size.

The result is a MM phono preamp with the possibility to adjust it perfect to the phono cartridge. With very low distortion, noise and humm.

Ronny

Last edited by Koifarm; 14th May 2014 at 01:52 PM.
  Reply With Quote
Old 9th September 2012, 01:24 PM   #2
oshifis is offline oshifis  Hungary
diyAudio Member
 
Join Date: Mar 2004
Location: Budapest, Hungary
Nice design. What is the purpose of D1/D2?
  Reply With Quote
Old 9th September 2012, 04:38 PM   #3
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
The diodes will do two things: crude match of charging voltage to cell voltage (perhaps not the best way to charge NiMH, but it will work), and preventing reverse current through regulator chip.

C6,7,8 appear in the circuit but not in the parts list.
  Reply With Quote
Old 9th September 2012, 05:18 PM   #4
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
Cool idea. How long does it run on a charge, and how low does it take to charge?
I've run a little Class-D amp off solar, but this is a better idea.
  Reply With Quote
Old 9th September 2012, 07:01 PM   #5
Koifarm is offline Koifarm  Netherlands
diyAudio Member
 
Koifarm's Avatar
 
Join Date: Aug 2005
C5,C6,C7,C8,C9 are all the same 10nf styroflex.

It runs for 20 houres, but when it is daylight it runs just on solarcells. Charging the empty accu's takes about 3 houres. But you can leave the solarscells on, there will no overcharge. At night when you have lights on it is better to switch off the solarcells, otherwise you can get some humm from your AC lights.

Ronny.
  Reply With Quote
Old 4th November 2012, 09:32 AM   #6
diyAudio Member
 
Join Date: Jul 2011
Hi, lovely idea and pcb layout. I used to use a single chip amp phono stage powered by a single 9v PP7 battery for long life. Wiring up a simple zener diode controlled power supply from a wall wart mains transformer was an astonishing upgrade. Moral here is that the power supply should have a low impedance, which a battery does not unless you regulate its output.
  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
Best rbb transistor, for MM phono preamp claudio Solid State 27 31st January 2013 12:58 AM
Swiss Physics model 5 preamp MM phono input Eric Tang Analogue Source 10 5th October 2010 01:53 PM
Phono preamp mm cartier20002000 Analogue Source 8 27th November 2007 03:17 AM
LT1028 mm phono preamp? miziq Analogue Source 9 27th April 2007 05:10 AM
minimalistic high end mm phono preamp diy ? miziq Analogue Source 1 9th July 2004 06:08 AM


New To Site? Need Help?

All times are GMT. The time now is 05:36 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