OT speaker feedback

Anyone know about electronics?
I have built a full size Dalek. For the voice I made a little kit with a mic
plugged in so it sounds like a Dalek. Its not very loud though. I have tried
two differant amps, a 45w and a 7w one. Both suffer from terrible feedback.
How do I stop feedback, apart from having the gain up too much?
Thanks
Richard
V8 90
V8 Discovery
www.richardsrovers.co.uk

On 2006-11-06, Richard <[email protected]> wrote:

> How do I stop feedback, apart from having the gain up too much?

You need to stop the sound from the speakers getting back into the
microphone, which is what causes feedback. Short of complicated
electronics, you need a microphone that is less sensitive but is
closer to the sound you want to pick up, or to try to direct the sound
away from the microphone (quite hard). A more directional microphone
can help a lot, they have to be pointed at the sound they are supposed
to be picking up, ones used for singing on-stage are usually of this
type.

--
Blast off and strike the evil Bydo empire!

Richard wrote:
> Anyone know about electronics?
> I have built a full size Dalek. For the voice I made a little kit with a mic
> plugged in so it sounds like a Dalek. Its not very loud though. I have tried
> two differant amps, a 45w and a 7w one. Both suffer from terrible feedback.
> How do I stop feedback, apart from having the gain up too much?

Frequency shifter.

Or make your mike much more directional -stop the pickup.

Steve

No guarantees, but try here for useful audio stuff.

http://www.epanorama.net/links/audiocircuits.html

Steve

Thanks for the reply.
The mic I'm using is a PC type one with headset and mic. The mic is almost
in my sons mouth! lol

Richard


"Ian Rawlings" <[email protected]> wrote in message
news:[email protected]...
> On 2006-11-06, Richard <[email protected]> wrote:
>
>> How do I stop feedback, apart from having the gain up too much?
>
> You need to stop the sound from the speakers getting back into the
> microphone, which is what causes feedback. Short of complicated
> electronics, you need a microphone that is less sensitive but is
> closer to the sound you want to pick up, or to try to direct the sound
> away from the microphone (quite hard). A more directional microphone
> can help a lot, they have to be pointed at the sound they are supposed
> to be picking up, ones used for singing on-stage are usually of this
> type.
>
> --
> Blast off and strike the evil Bydo empire!

Richard wrote:
> Thanks for the reply.
> The mic I'm using is a PC type one with headset and mic. The mic is almost
> in my sons mouth! lol
>
Those ARE fairly directional. What happens if you try and shield it with
your hands ?

Steve

steve Taylor <[email protected]> uttered summat worrerz
funny about:
> Richard wrote:
>> Thanks for the reply.
>> The mic I'm using is a PC type one with headset and mic. The mic is
>> almost in my sons mouth! lol
>>
> Those ARE fairly directional. What happens if you try and shield it
> with your hands ?
>
> Steve

I'd guess he sounds like a Dalek! ;-)

Lee D

steve Taylor wrote:
> No guarantees, but try here for useful audio stuff.
>
> http://www.epanorama.net/links/audiocircuits.html
>
> Steve

Try also to make the speakers directional, at least put them away from the mike
and point them away.

--
Don't say it cannot be done, rather what is needed to do it!

If the answer is offensive maybe the question was inappropriate

The fiend of my fiend is my enema!

In message <[email protected]>, Lee_D
<[email protected]> writes
>steve Taylor <[email protected]> uttered summat worrerz
>funny about:
>> Richard wrote:
>>> Thanks for the reply.
>>> The mic I'm using is a PC type one with headset and mic. The mic is
>>> almost in my sons mouth! lol
>>>
>> Those ARE fairly directional. What happens if you try and shield it
>> with your hands ?
>>
>> Steve
>
>I'd guess he sounds like a Dalek! ;-)
>
I'd look at the speaker and how and where it's mounted. As far away from
the mic as possible, not mechanically coupled to any part of the
woodwork, and pointed away from the mic.

Then try different mics.

The frequency shifter mentioned above would also be a thing to try if
you can find or build one. With that in use the feedback happens much
later and has a whooping sound.

Possibly try some sort of graphic equaliser between the mic and the amp.
--
Bill

"Richard" <[email protected]> wrote in message
news:[email protected]...
> Anyone know about electronics?
> I have built a full size Dalek. For the voice I made a little kit with a
> mic plugged in so it sounds like a Dalek. Its not very loud though. I have
> tried two differant amps, a 45w and a 7w one. Both suffer from terrible
> feedback.
> How do I stop feedback, apart from having the gain up too much?
> Thanks
> Richard
> V8 90
> V8 Discovery
> www.richardsrovers.co.uk
>

Decouple the speaker from the Dalek body. How's it mounted? Is it in it's
own enclosure? It should be. Position it away from the alien's... sorry,
your son's mouth. And point it away. It is on the *outside* of the Dalek,
isn't it? Otherwise you've created a perfect feedback chamber.

IME the cheaper headset mics are omnidirectional, not uni- and that won't
help. Ensure it's uni.
Happy exterminating.