Superstar 3900N Dimmer sensor

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13EL121
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Superstar 3900N Dimmer sensor

Post by 13EL121 » 10 May 2019, 05:13

Hi friends,

Looking for a replacement part of the auto dimmer sensor of a Superstar 3900N.

Is it a photodiode or a Transistor? No schematic found anywhere.

Thanks and 73,
Ralf

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13EL121
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Re: Superstar 3900N Dimmer sensor

Post by 13EL121 » 30 May 2019, 09:33

Problem fixed. The sensor is a phototransistor. But I set a 500k potentiometer in parallel to the PT to adjust the dimming level.

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Re: Superstar 3900N Dimmer sensor

Post by cb4ever104 » 30 May 2019, 10:48

13EL121 wrote:
30 May 2019, 09:33
Problem fixed. The sensor is a phototransistor. But I set a 500k potentiometer in parallel to the PT to adjust the dimming level.
Thanks for letting us know Ralf !
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
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Re: Superstar 3900N Dimmer sensor

Post by 13EL121 » 30 May 2019, 12:35

Ordered this phototransistor,

https://rover.ebay.com/rover/0/0/0?mpre ... 3522265920

Maybe there are better types, but it works.

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