tongenerator

children toy keyboard animal noise
« on: September 28, 2009, 11:17:21 AM »
Hello,

i found an old kids keyboard on the street... one that does animal noise is well...

i want to connect it to my sherman filterbank...
what i did... i used a resistor high enough to become around 1 V for Signal
regular there is a speaker with 4,5 V and 47 mA...
for some reason it does not work, i only get hum noise... but when i earth + of the speaker
input is fine but very low...

how can i convert the Speaker of that Toy into Line Signal  ;D

thanks for any advice

Mark


tongenerator

Re: children toy keyboard animal noise
« Reply #1 on: September 28, 2009, 07:12:37 PM »


i have now made this curcit, and i have about 1 V at the output...
but the sound is very low and also distorted... when i have it connected to
the mixer i have no hum, at the sherman i have serious hum...

can a curcuit with a NE5532 help?

kazper

Re: children toy keyboard animal noise
« Reply #2 on: September 28, 2009, 11:20:59 PM »
This may not be the most scientific method but most of the circuit benders just replace the speaker with a 1/4" jack.

Since your trying to isolate it from the input of the Sherman and the Toy has a small amplified output. You could probably just run it to a small 1:1 transformer and be just fine.

Kaz
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tongenerator

Re: children toy keyboard animal noise
« Reply #3 on: October 01, 2009, 09:28:29 AM »
i used a 10 K resistor and placed it on a spot between the sound chip and the transistor (c9013) which connects to the speaker...
at that spot i have 0,8 V and a loud signal without any distortion or hum

thanks for your tip, a transformer would be a good idea because of the impedance

« Last Edit: October 01, 2009, 09:32:23 AM by tongenerator »

kazper

Re: children toy keyboard animal noise
« Reply #4 on: October 01, 2009, 10:24:32 AM »
Check for DC on the output side of that 10K and add a capacitor as needed.
Intentionally left blank


 

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