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Audio > Audio Technology > Re: Amplifier P...
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Re: Amplifier Problem - Revised Schematic

by don pearce <nospam@[EMAIL PROTECTED] > Apr 22, 2008 at 04:35 PM

GregS wrote:
> In article
<bb9d022f-3212-41a4-b455-e8d7f6cbd09c@[EMAIL PROTECTED]
>,
EADGBE <hwbosshoss@[EMAIL PROTECTED]
> wrote:
>> On Apr 22, 10:34 am, zekfr...@[EMAIL PROTECTED]
 (GregS) wrote:
>>> Where did you get this diagram. Is it completely from scratch ?
>>>
>> Greg:
>>
>> No, it was copied, carefully, from the original schematic.  I would
>> have scanned the original schematic, but it is very fuzzy.  I did
>> check my schematic against the other channel's schematic, which was a
>> bit clearer but did not have the expected voltages indicated, and was
>> cluttered with the actual component values.
>>
>> I have checked, re-checked, and RE-checked the accuracy of my hand-
>> drawn schematic, comparing it to the original, and there are no
>> mistakes.
> 
> The emitter of Q204 has a strange DC path. The amplifier appears
> non inverting. What is the voltage on Q204 collector ?
> 
> greg

Q204 is in a pretty simple DC feedback path with Q205 and the 207/8 
combination. Its emitter currrent flows down through Q208 to ground.

The amplifier is non-inverting from the base of Q204, but inverting from 
its emitter, which is where both the DC and AC feedback end up.

d
 




 38 Posts in Topic:
Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-21 21:08:40 
Re: Amplifier Problem - Revised Schematic
"Richard Crowley&quo  2008-04-21 21:48:36 
Re: Amplifier Problem - Revised Schematic
don pearce <nospam@[EM  2008-04-22 15:18:26 
Re: Amplifier Problem - Revised Schematic
bz <bz+spr@[EMAIL PROT  2008-04-22 07:38:03 
Re: Amplifier Problem - Revised Schematic
bz <bz+ser@[EMAIL PROT  2008-04-22 07:45:45 
Re: Amplifier Problem - Revised Schematic
"Gareth Magennis&quo  2008-04-22 08:42:57 
Re: Amplifier Problem - Revised Schematic
"Gareth Magennis&quo  2008-04-22 12:21:55 
Re: Amplifier Problem - Revised Schematic
Eeyore <rabbitsfriends  2008-04-22 12:34:19 
Re: Amplifier Problem - Revised Schematic
"James" <jam  2008-04-22 07:33:36 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 04:54:48 
Re: Amplifier Problem - Revised Schematic
"James" <jam  2008-04-22 08:05:46 
Re: Amplifier Problem - Revised Schematic
bz <bz+ser@[EMAIL PROT  2008-04-22 12:26:29 
Re: Amplifier Problem - Revised Schematic
"James Sweet" &  2008-04-22 16:49:36 
Re: Amplifier Problem - Revised Schematic
Ol' Duffer <nospam@[EM  2008-04-22 09:16:43 
Re: Amplifier Problem - Revised Schematic
John Phillips <news080  2008-04-22 14:08:56 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 06:22:28 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 06:25:04 
Re: Amplifier Problem - Revised Schematic
"Arny Krueger"   2008-04-22 09:44:01 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 07:26:42 
Re: Amplifier Problem - Revised Schematic
John Phillips <news080  2008-04-22 14:31:07 
Re: Amplifier Problem - Revised Schematic
zekfrivo@[EMAIL PROTECTED  2008-04-22 14:34:55 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 07:43:33 
Re: Amplifier Problem - Revised Schematic
zekfrivo@[EMAIL PROTECTED  2008-04-22 15:29:49 
Re: Amplifier Problem - Revised Schematic
don pearce <nospam@[EM  2008-04-22 16:35:38 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 08:17:28 
Re: Amplifier Problem - Revised Schematic
zekfrivo@[EMAIL PROTECTED  2008-04-22 15:51:20 
Re: Amplifier Problem - Revised Schematic
John Phillips <news080  2008-04-22 16:03:42 
Re: Amplifier Problem - Revised Schematic
"Richard Crowley&quo  2008-04-22 09:44:41 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 08:41:02 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 10:04:49 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 11:01:14 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 11:13:19 
Re: Amplifier Problem - Revised Schematic
zekfrivo@[EMAIL PROTECTED  2008-04-22 18:42:00 
Re: Amplifier Problem - Revised Schematic
"David Farber"   2008-04-22 11:29:34 
Re: Amplifier Problem - Revised Schematic
Eeyore <rabbitsfriends  2008-04-22 19:52:31 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 12:05:26 
Re: Amplifier Problem - Revised Schematic
zekfrivo@[EMAIL PROTECTED  2008-04-22 20:09:33 
Re: Amplifier Problem - Revised Schematic
jakdedert <jakdedert@[  2008-04-22 19:34:40 

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