[ICOM] PS-35 IC-1 Part??

[Jim W7RY]

I'm going to modernize the circuit and use a opto-isolator.

More details to follow.
73
Jim W7RY


At 12:37 AM 7/1/2005, Adam Farson wrote:
>Hi Jim,
>
> >From the PS-35 schematic, it looks as if the resistance range of the LDR is
>50 ~ 5000 ohms or thereabouts. Philips may still manufacture these devices
>(Light Dependent Resistor or LDR). You could try a Google search on these
>terms and on "photoresistor".
>
>Cheers for now, 73,
>Adam VA7OJ/AB4OJ
>
>
>-----Original Message-----
>From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
>Behalf Of Jim W7RY
>Sent: 01 July 2005 00:15
>To: icom at mailman.qth.net
>Subject: [ICOM] PS-35 IC-1 Part??
>
>I'm troubleshooting a PS-35. (internal supply for a 751).
>
>I have found that IC-1 which is a neon bulb and a CDS cell, is weak and the
>resistance does not go low enough to enable the supply.
>
>Any ideas where to get one? Any ideas on the value of the CDS cell? The neon
>lamp seems to work just fine and is fairly bright so I suspect the CDS cell
>itself.
>
>Thanks and 73
>Jim W7RY
>
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