agi 511 preamplifier - diyAudio
Go Back   Home > Forums > Commercial Sector > Group Buys

Group Buys Members group buys

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 27th January 2015, 07:18 PM   #1
scafas is offline scafas  Italy
diyAudio Member
 
Join Date: Dec 2007
Location: italia
Default agi 511 preamplifier

I would like to propose this buying group for the pcb to clone the preamplifier AGI 511 .
improvements to the pcb are welcome .
price ' of $ 15 .
measures are 125x95mm
ship cost $7
components and reference number are original some in the schematic.
Click the image to open in full size.
  Reply With Quote
Old 28th January 2015, 04:02 PM   #2
diyAudio Member
 
Join Date: Mar 2005
Location: Rimini
Ok! I'm here.
Whereare schematics?
I know this baby, it's very difficult to build because you should customise some resistors values! Is based on Ua709 with output transistors disabled!
Ciao

P.S. Puoi scrivermi via PM in quanto sono italiano. Grazie
  Reply With Quote
Old 28th January 2015, 05:19 PM   #3
scafas is offline scafas  Italy
diyAudio Member
 
Join Date: Dec 2007
Location: italia
Default schematic

Quote:
Originally Posted by cicero32 View Post
Ok! I'm here.
Whereare schematics?
I know this baby, it's very difficult to build because you should customise some resistors values! Is based on Ua709 with output transistors disabled!
Ciao

P.S. Puoi scrivermi via PM in quanto sono italiano. Grazie
Attached Files
File Type: pdf 511A Standard Gain Schematic.pdf (94.1 KB, 202 views)
  Reply With Quote
Old 9th February 2015, 07:26 PM   #4
diyAudio Member
 
Join Date: Mar 2005
Location: Rimini
This pre could process signals in excess of 100 MHz and with a Slew rate of 200V/uSec! The printed board proposed it's not capable to meet Rf requisites for this proposed assembly!

Questo pre può processare segnali Rf da 100 e più MHz con SR da 200 V/Usec e più!
Servirebbe un cablaggio per Rf con circuito doppia faccia ed estesi piani di massa! Il circuito stampato proposto , secondo me, non ha i requisiti: Meglio sarebbe rifare un clone anche nel cablaggio!
  Reply With Quote
Old 9th February 2015, 07:46 PM   #5
scafas is offline scafas  Italy
diyAudio Member
 
Join Date: Dec 2007
Location: italia
Quote:
Originally Posted by cicero32 View Post
This pre could process signals in excess of 100 MHz and with a Slew rate of 200V/uSec! The printed board proposed it's not capable to meet Rf requisites for this proposed assembly!

Questo pre può processare segnali Rf da 100 e più MHz con SR da 200 V/Usec e più!
Servirebbe un cablaggio per Rf con circuito doppia faccia ed estesi piani di massa! Il circuito stampato proposto , secondo me, non ha i requisiti: Meglio sarebbe rifare un clone anche nel cablaggio!
cablaggio tipo radioline anni 70 .....na ficata .
questo stampato e' doppia faccia ma lasciamo perdere.
  Reply With Quote
Old 12th February 2015, 07:01 PM   #6
diyAudio Member
 
Join Date: Mar 2005
Location: Rimini
Scusami, non volevo offenderti, non era mia intenzione, il mio inglese come avrai potuto notare è pessimo ma avevo infilato il mio commento in italiano, succinto perchè siamo in un forum straniero e dovremmo fare capire anche ad altri quello che sta succedendo.
Conosco bene questo progetto e niente mi farebbe più felice di poterlo riprodurre, tanto è vero che mi sono subito impegnato. Mi sono studiato sia il circuito che il tuo circuito stampato e purtroppo questo attuale non è all'altezza della bisogna. Questo non impedisce che si possa studiare una altra opzione. probabilmente la soluzione migliore sarebbe replicare il cablaggio originale, anche così però, resta il fatto che il circuito E' DI FATTO UN AMPLIFICATORE RF e come tale deve essere trattato. Tra l'altro non tutti i U 709 vanno bene ma ci vogliono quelli in ceramica oppure esemplari selezionati per avere capacità di trattare RF. La genialità del progetto (NASA) è quella di usare gli stadi d'ingresso del circuito integrato ma di sostituire lo stadio d'uscita con un altro in grado di trattare segnali a frequenza altissima (si notano capacità di compensazione sul circuito) e valori resistivi custom circuito per circuito per avere ottimizzazione RF). La banda passante è così larga che molte volte, in Italia, grazie alle stazioni FM commerciali il pre funziona anche senza essere acceso in quanto i campi RF delle radio libere sono in grado di fare funzionare il pre anche senza alimentazione. Detto questo, a parte il sarcasmo su cablaggi radioline, cosa intendi fare? Ti prego di farmi sapere, grazie.
saluti cordiali cicero32
  Reply With Quote
Old 12th February 2015, 11:29 PM   #7
diyAudio Member
 
meanman1964's Avatar
 
Join Date: Oct 2006
Location: Belgium the land of chocolate
English Please
  Reply With Quote
Old 13th February 2015, 05:34 AM   #8
scafas is offline scafas  Italy
diyAudio Member
 
Join Date: Dec 2007
Location: italia
Quote:
Originally Posted by meanman1964 View Post
English Please

My friend here says that my pcb not work but he does not explain why ' .
he says that the bandwidth of the agi511 is so large that many times , in Italy , thanks to the pre commercial FM stations also works without being turned on because the RF field of free radios are able to run the pre without power .
  Reply With Quote
Old 13th February 2015, 12:13 PM   #9
diyAudio Member
 
Join Date: Mar 2005
Location: Rimini
Smile AGI Pre- A prayer to Mr Curl.

Quote:
Originally Posted by meanman1964 View Post
English Please
AGI preamplifier is a preamplifier with a bandpass of more than 100MHz and with an elevated Slew Rate (nearly 200 V/Usec). This is due to project able to process RF signals. It's a real RF preamplifier, very critical to tune and prone to RF oscillations. The lauout it's very critical and in PCB design we should take precautions (low capacity layout, accurate ground design etc.). This is the maximun i can explain with my poor english language. It's a very unusual design and i ask for other technical advice; maybe Mr J. Curl would say a word about this? ciao
  Reply With Quote
Old 16th February 2015, 11:08 PM   #10
Just DIY!
diyAudio Member
 
pinnocchio's Avatar
 
Join Date: Sep 2010
Location: Montreal
You could ask Alex mm, he's very experimented with PCB layouts. Also, the use of a teflon PCB could help and maybe a ground plane layer.

Ciao!
Do
__________________
PREAMPs : AMB α10 + AMB-OpFab-01 | Balanced DCB1 | LDR3x | AMPs: AMB β24 | Aleph 5 | FirstOne | ML-2 | TSSA | Telos 390 Clone | NX Amp
DACs : TPA Buffalo II + OPC's NTD1 I/V | JLsounds AK4396 | Moon 380D DSD Speakers : Troels ATS-4 in progress | Astasia SD | Tubasson Mk II
  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
Altec 511 b, Selenium d220ti, an others. duder1982 Swap Meet 1 18th May 2013 09:49 PM
FS: Altec 511 horns, Seattle SirByrd Swap Meet 0 9th November 2012 12:53 AM
Vertical mounting Altec 511, or others? Pengvim Multi-Way 1 8th October 2009 06:14 AM
Sony TA-N 511 amp, any info? Vix Solid State 0 30th November 2007 02:36 PM
altec 511 b drivers snivit Multi-Way 6 31st May 2005 02:44 PM


New To Site? Need Help?

All times are GMT. The time now is 04:15 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright ©1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2