Bruel & Kjaer 4230 Sound Level Calibrator - diyAudio
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Old 2nd August 2014, 02:13 PM   #1
forr is offline forr  France
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Default Bruel & Kjaer 4230 Sound Level Calibrator

I've found a Bruel & Kjaer 4230 Sound Level Calibrator which has quite suffered, being not used for many years with a linking battery and some components failed due to an error when connected to a lab bench supply.

I have changed some transistors and capacitors, and it now delivers a fine 1 Vrms sinus across the piezo driver.

However, I thought it would start to do that only for a couple of seconds when the switch is pressed and then goes off .

Instead of that, the sound is emitted as soon as the battery is connected and does not stopped until the battery is removed.

Pressing the switch appears to do nothing.

I do not have the schematics.

Can someone help me to recover the initial functionning state of this litte tool ?

Here some photos :
Attached Images
File Type: jpg B&K_MicCalibrator4230_1.JPG (104.1 KB, 49 views)
File Type: jpg B&K_MicCalibrator4230_2.JPG (106.9 KB, 50 views)
File Type: jpg B&K_MicCalibrator4230_3.JPG (92.3 KB, 48 views)
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Old 2nd August 2014, 02:55 PM   #2
AVWERK is offline AVWERK  United States
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There is a on period to allow you to adjust the DB level of the mic as I recall.
I,ll have to get mine out since I haven,t used it in awhile.


Regards
David

Maybe the button is bad?

Last edited by AVWERK; 2nd August 2014 at 02:56 PM. Reason: Button
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Old 2nd August 2014, 09:04 PM   #3
forr is offline forr  France
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Quote:
Originally Posted by AVWERK View Post
There is a on period to allow you to adjust the DB level of the mic as I recall.
I,ll have to get mine out since I haven,t used it in awhile.]Maybe the button is bad?
Thanks for the help.
The PCB is out of the box. When I press the switch, it makes the contact correctly.
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Old 3rd August 2014, 07:40 AM   #4
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Forr,

This is kind of funny. When I saw your pics of your button I was thinking
you pulled apart an old VOX Wha Wha Guitar pedal.
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Old 3rd August 2014, 01:55 PM   #5
forr is offline forr  France
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Quote:
Originally Posted by SyncTronX View Post
Forr,
This is kind of funny. When I saw your pics of your button I was thinking
you pulled apart an old VOX Wha Wha Guitar pedal.
Yes, seeing the PCB, quite hard to think that the manufacturer is the most known for acoustic measurement tools.
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