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From: Sjouke Burry on 9 Jun 2010 10:10
jameswaters(a)unlisted.com wrote:
> On Wed, 09 Jun 2010 08:03:00 -0400, Meat Plow <mhywatt(a)yahoo.com>
> wrote:
>
>> On Wed, 09 Jun 2010 05:27:33 -0500, jameswaters(a)unlisted.comwrote:
>>
>>> I plugged my computer output into my stereo. Its an old 1970s stereo
>>> with built in cassette tape deck and phono input. There is no AUX
>>> input, so I put it in the phono input. It works but it's overdriven
>>> and distorts unless I keep the computer level real low. I know what's
>>> wrong. Phono inputs are highly pre-amped. Too much pre-amp for what
>>> I'm doing. I believe they sell attenuators, (maybe Radio Shack), but
>>> I was wondering if all I need to do is put a resistor on each channel
>>> cable. There are no longer any Radio Shack stores nearby me. Will
>>> the resistors work? Do I put them in series, or across the input to
>>> the ground? What value should I use.
>>>
>>> Thanks
>>>
>>> James W.
>> Don't plug it into the phono input.
>
> Right, and where should I plug it? I said there is no AUX and no
> other inputs. The tape deck is built in, so no tape inputs either.
> The phono is the ONLY input.
>
> I'll try the resistors as posted.
>
> I was also wondering what would happen if I put an equalizer in
> between? Suppose all I can do it try it. I have a small 6 band one
> that I'm not using. I guess that could compensate for the RIAA too.
> Although I really find the bass and treble pretty much ok. Besides
> using the bass and treble controls on the receiver, I can fine tune
> the sound in Winamp.
>
> Thanks
>
I dont know if you can find it, but there is a small gadget, that
goes into a tapedeck, and feeds the signal to the tapereader head.
A friend of me uses it often.
From: Dave Plowman (News) on 9 Jun 2010 10:52
In article <4c0fa0dc$0$14126$703f8584(a)textnews.kpn.nl>,
Sjouke Burry <burrynulnulfour(a)ppllaanneett.nnll> wrote:
> I dont know if you can find it, but there is a small gadget, that
> goes into a tapedeck, and feeds the signal to the tapereader head.
> A friend of me uses it often.

Normally sold for car use. When cars had tape decks.

--
*24 hours in a day ... 24 beers in a case ... coincidence? *

Dave Plowman dave(a)davenoise.co.uk London SW
To e-mail, change noise into sound.
From: Wild_Bill on 9 Jun 2010 13:22
Assuming there is an FM tuner in the stereo, there are inexpensive RF
transmitters in stores for playing iPuds thru car radios or other systems.

I found one a while ago for maybe $3 at a discount place, but don't know how
it actually sounds, as I haven't tried using it.

--
Cheers,
WB
..............


<jameswaters(a)unlisted.com> wrote in message
news:pnqu06dd0b8see7aak4elch4og62e1j11j(a)4ax.com...
>I plugged my computer output into my stereo. Its an old 1970s stereo
> with built in cassette tape deck and phono input. There is no AUX
> input, so I put it in the phono input. It works but it's overdriven
> and distorts unless I keep the computer level real low. I know what's
> wrong. Phono inputs are highly pre-amped. Too much pre-amp for what
> I'm doing. I believe they sell attenuators, (maybe Radio Shack), but
> I was wondering if all I need to do is put a resistor on each channel
> cable. There are no longer any Radio Shack stores nearby me. Will
> the resistors work? Do I put them in series, or across the input to
> the ground? What value should I use.
>
> Thanks
>
> James W.

From: Dave Platt on 9 Jun 2010 14:11
In article <SrLPn.372$234.205(a)newsfe11.ams2>,
Arfa Daily <arfa.daily(a)ntlworld.com> wrote:

>>> I plugged my computer output into my stereo. Its an old 1970s stereo
>>> with built in cassette tape deck and phono input. There is no AUX
>>> input, so I put it in the phono input. It works but it's overdriven
>>> and distorts unless I keep the computer level real low. I know what's
>>> wrong. Phono inputs are highly pre-amped. Too much pre-amp for what
>>> I'm doing. I believe they sell attenuators, (maybe Radio Shack), but
>>> I was wondering if all I need to do is put a resistor on each channel
>>> cable. There are no longer any Radio Shack stores nearby me. Will
>>> the resistors work? Do I put them in series, or across the input to
>>> the ground? What value should I use.
>>
>> A phono input is also equalised to the RIAA curve used by records. This
>> will cut the treble and boost the bass from your computer signal.

>Very true, but assuming that you can live with that / correct it enough
>with the computer's graphic eq control panel, then you will need two
>resistors for each channel, one in series and then one to ground to form
>a potential divider. I would suggest initially trying about 10 : 1 so
>suitable values might be 47k ohms in series with the 'live' leg of the
>feed, and then 4.7k ohms from the 'amplifier' side of that new resistor,
>to the 'ground' leg of the feed.

That assumption about being able to correct it adequately with the
computer's EQ may be a bit of a stretch... there are likely to be some
significant frequency errors.

The OP might want to try building a simple "inverse RIAA" equalization
circuit, which would also act as an attenuator. By inserting this
between the incoming signal and the PHONO input jack, it would cancel
out the PHONO input circuit's relatively high gain, and also reduce
the signal level enough to avoid overdriving. These really aren't all
that much more complex than just a two-resistor voltage divider...
only three more components are needed.

Take a look at the following document:

http://waltjung.org/PDFs/A_High_Accuracy_Inverse_RIAA_Network.pdf

It shows the designs for several different inverse-RIAA networks. The
intent was to provide readers with the ability to build an inverse
RIAA network which was accurate enough that it could be used to test
different phono preamplifiers and detect any inaccuracies in their
RIAA stages. The networks seem to have been designed on the
assumption that they are being fed from a signal generator /
oscillator, having a relatively high voltage level and a 300-ohm
output impedance. That's probably a good enough approximation for the
behavior of a computer sound card's LINE OUT jack for these circuits
to be used with acceptable results.

The circuits aren't complex. The oldest version (by Reg Williamson)
requires three resistors and two capacitors, per channel. I'd guess
that you can probably buy acceptably-close-to-the-right-value parts at
Radio Shack even today... if not, Mouser or Digi-Key will certainly
have them. Any electronics hobbyist you know, can probably find
acceptable parts in his/her junk box. The whole circuit could be
haywired together into the middle of a "quarter-inch stereo miniplug,
to two RCA plugs" jumper cable (again, even Radio Shack has these),
insulated with tape or heat-shrink tubing or "liquid electrical tape",
and you'd be good to




--
Dave Platt <dplatt(a)radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
From: David Nebenzahl on 9 Jun 2010 14:19
On 6/9/2010 6:31 AM William R. Walsh spake thus:

> Well, if you don't have an AUX connector, how about one for TAPE?

Apparently you missed the part where the OP said "I said there is no AUX
and no other inputs."

Here's another suggestion to the OP: since you're contemplating doing a
little project where you have to solder up stuff, why not just tap
directly into the stereo's line-level input? Wouldn't be difficult at
all: just locate the volume control (undoubtedly a 2-gang
potentiometer), and wire a connector for the computer input across the
ground and high sides of each pot. Should work fine.


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)
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