¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. MicBuilders
  2. Topics

Sunlight is lowering the sensibility of PUI 5024 electret mic capsules - feels like magic...

 

Hey, i've researched a lot about this, but i cant seem to find any explanation to what i'm dealing with...
I'm using the simple P48 circuit and the PIU 5024 electret mic capsules, and i'm super impressed by their sensibility. I'm a fan.
?
Just one thing is making my head hurt, when in direct contact with sunlight, the sensibility drops instantaneously, and if i get them back to shadow, the signal gain goes back to normal.... Is this normal? Even with the sponge windscreen on!?
?
Is this magic? Should I just make them little sunshades??
?
Thank you for any info! <3
?
?
 

Am 10.09.24 um 11:23 schrieb ²õ¨¦°ù²µ¾±´Ç³å³¦²¹³¦³ó¾±²ú²¹³¦³ó±ð via groups.io:

Is this magic? Should I just make them little sunshades?
Strange. Never heard of anything like this. Might be a semiconductor
reacting to heat.

Ralf

--
Ralf R. Radermacher - K?ln/Cologne, Germany
Blog :
Audio :
Fotos :

 

¿ªÔÆÌåÓý

If not frequent, that is explainable. All semiconductors are sensible to light, to variable degrees. It seems the FET in your capsule is not lightproof.

Le 10/09/2024 ¨¤ 11:23, ²õ¨¦°ù²µ¾±´Ç³å³¦²¹³¦³ó¾±²ú²¹³¦³ó±ð a ¨¦crit?:

Hey, i've researched a lot about this, but i cant seem to find any explanation to what i'm dealing with...
I'm using the simple P48 circuit and the PIU 5024 electret mic capsules, and i'm super impressed by their sensibility. I'm a fan.
?
Just one thing is making my head hurt, when in direct contact with sunlight, the sensibility drops instantaneously, and if i get them back to shadow, the signal gain goes back to normal.... Is this normal? Even with the sponge windscreen on!?
?
Is this magic? Should I just make them little sunshades??
?
Thank you for any info! <3
?
?
 

Am 10.09.24 um 12:49 schrieb Jerry Lee Marcel via groups.io:
If not frequent, that is explainable. All semiconductors are sensible to
light, to variable degrees. It seems the FET in your capsule is not
lightproof.
Another possible explanation.

Does the gain react spontaneously to the irradiation (light) or
gradually and with a certain delay (temperature)?

Ralf

--
Ralf R. Radermacher - K?ln/Cologne, Germany
Blog :
Audio :
Fotos :

 

Thank you Ralf and Jerri!?
Thats what I thought but I have no knowledge about this type of characteristics. I just wanted to make sure this could happen!
 

Am 10.09.24 um 13:48 schrieb ²õ¨¦°ù²µ¾±´Ç³å³¦²¹³¦³ó¾±²ú²¹³¦³ó±ð via groups.io:
Thank you Ralf and Jerri!
Thats what I thought but I have no knowledge about this type of
characteristics. I just wanted to make sure this could happen!
The first germanium transistors where housed in small glass tubes,
painted black on the outside in order to screen them from just this
effect. Scratch off the paint and you had a photo transistor. :-)

Ralf

--
Ralf R. Radermacher - K?ln/Cologne, Germany
Blog :
Audio :
Fotos :

 

One possible solution; after soldering wires to the capsule, paint ?the back side black with some non-conductive paint to keep light off.
?
The transistor radio I built as a child didn't work outdoors unless I shaded it with my hand. The CK722 transistors were encased in clear plastic.
?
 
Edited

Ralf, the "gain react spontaneously to the irradiation (light)", instantly ?
?
Henry, thanks for the advise, I will try to paint the back of the capsules as you suggest! But I guess I'll just have to be a bit careful with direct sunlight!?

1 - 8 of 8