MK 171 Dynamic Microphone & Hi-Fi Connections

Hi

I’m thinking about buying a MK 171 voice changer kit but would like to use a dynamic microphone and connect the speaker output to the line input of a hi-fi. Is there any way I can do this?

I was thinking that I could lower the output of the speaker connection by using a lower 3 volt battery but I’m not sure if this would be too low for the rest of the circuit. Would increasing the resistance on the microphone connection allow a dynamic microphone to work properly?

Also, are there any sound samples of the MK 171’s effects? I’m looking for a vocoder effect like this one: youtube.com/watch?v=-hqvvNcvenU

Many thanks

Matt

You will need to attenuate the speaker output by means of a potentiometer before connecting it to a line-in.
Remove the supply resistor for the electret mic.
Not sure output of a dynamic mic will be able to drive the circuit, you will have to experiment.

I’ll start experimenting! Thanks for your help

Hi all Vel417 stated in a previous post…

“You will need to attenuate the speaker output by means of a potentiometer before connecting it to a line-in.”

Do you have any further info as to what potentiometer i need to buy to attenuate the speaker output?

I live in UK, so a product code and place of purchase would be VERY beneficial.
A certain auction sale would do :unamused: :wink:

I will be using the kit in the following setup.

Mic - Mixing Desk (aux or group output) - patch bay - MK171 - patch bay - Mixing desk - pc to record output

I understand that i need to remove R6 to facilitate changing the mic to a jack input, but am i right in thinking i have to attenuate the output with a pot too?

Any help you guys can give would be excellent as i need to know this info before buying it. :wink:

Thanks.
djhddnb

A 22K log pot will do the job.

Thanks vel417 for the info.

Do you know where i can get a 22K log pot in U.K.?

Sorry for the newbies questions but im a late starter into electronics.

Thanks in advance :wink:

djhddnb

An electronics store, such as the place where you bought the kit, would be a good place to look for a pot…

Thanks for the reply vel417, but i bought the kit from a well known auction site not a shop.

djhddnb

http://www.velleman.be/dealer/search/?step=3&cid=57&did=1

Would this be the pot im looking for for the output attenuatation?

cgi.ebay.co.uk/22K-POTENTIOMETER … |294%3A200

Thanks in advance
djhddnb

It will work, but as it is linear and not logarithmic, the adjustment range will be awkward.

Thanks for the swift reply vel417

I’m not quite sure of the pot i need as the last one i posted was wrong.

Could this be the one i need - the single version, i take it???

cgi.ebay.co.uk/23E-1-turn-carbon … |294%3A200

Also if i wire up this 22k pot on the output incorrectly, will i damage the whole circuit or will it just not work until it has been rectified i.e. re-soldered the correct way?

Thanks in advance
djhddnb

Pot looks ok.
Should not be a problem if wired incorrectly.

I have finished building the kit to spec, i wanted to build the kit “as is” before changing the circuitry to a jack input and jack output but i can only seem to get a sound out if i short R5 and R6 with a screwdriver.

This makes the circuit create its own sound, not my vioce through the mic.

My soldering skills are fair so i dont think its my soldering.

Can you help???

Thanks in advance
djhddnb

Oops i made a mistake in my last post.
The resisters i short to get any sound are R4 and R5

djhddnb

I think i have spotted the cause of the problem but can anyone verify this before i go un-soldering?

I used the picture on the box to build the kit as well as the instructions but i’m a little confused.

Am i correct in thinking that ALL the resisters should be soldered with the gold band coverivng the R printed on the board?

The reason i ask is that ALL APART FROM R9 and R10 show this to be the case on the picture.

Do i need to turn R9 and R10 around?

Thanks in advance
djhddnb

Resistors do not have a polarity.
You can mount them any way you like

Hmm, that’s strange, as the instructions seem to indicate that the resisters DO have to go in a certain way.
If the picture on the box is indeed correct, then i have R9 and R10 the wrong way round.

djhddnb

Trust me, if the picture shows this, then it is a coincidence.
We strongly suggest that you read a textbook on basic electronics before attempting to complete any project.