Fw: Fw: Fw: [Premium-Rx] WJ AN/URR-74 help
L D Ritta
ufp at optusnet.com.au
Thu Oct 23 09:20:55 EDT 2008
----- Original Message -----
From: L D Ritta
To: carcia at sbcglobal.net
Sent: Thursday, October 23, 2008 11:46 PM
Subject: Re: Fw: Fw: [Premium-Rx] WJ AN/URR-74 help
I have found a possible replacement for the DS8857J the MC14547 which will handle up to 65mA
the pinout is the same. There is also the HDSP-E103 these are rated at 45mA
Lee
----- Original Message -----
From: FRANCIS CARCIA
To: L D Ritta
Sent: Thursday, October 23, 2008 11:16 PM
Subject: Re: Fw: Fw: [Premium-Rx] WJ AN/URR-74 help
I've been able to reduce the voltage/current on LEDs a lot and still be able to see the display.
Add a few series diodes in the LED common VCC lead or ground lead. This will reduce voltage and current.frank
--- On Thu, 10/23/08, L D Ritta <ufp at optusnet.com.au> wrote:
From: L D Ritta <ufp at optusnet.com.au>
Subject: Fw: Fw: [Premium-Rx] WJ AN/URR-74 help
To: premium-rx at mailman.qth.net
Date: Thursday, October 23, 2008, 12:05 AM
Glen
I can not email you direct your software is blocking my emails.
Lee
----- Original Message -----
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To: <ufp at optusnet.com.au>
Sent: Thursday, October 23, 2008 2:16 PM
Subject: Returned mail: see transcript for details
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----- Original Message -----
From: L D Ritta
To: Glenn Little
Sent: Thursday, October 23, 2008 2:17 PM
Subject: Re: Fw: [Premium-Rx] WJ AN/URR-74 help
Yes it is as I can not anything else to do the same current the only one that came close
is the cd4511 but it will only handle 25ma and I have not found any leds which have the same pinouts
and only 25ma. the lowest current hp leds go is with their low current series but that is 45ma.
So yes it looks like it unless I redesign the pcb
73 Lee
----- Original Message -----
From: Glenn Little
To: L D Ritta
Sent: Thursday, October 23, 2008 1:39 PM
Subject: Re: Fw: [Premium-Rx] WJ AN/URR-74 help
Is the chip that you are looking for a DS8857J?
Glenn
WB4UIV
At 12:34 PM 10/22/2008, you wrote:
----- Original Message -----
From: L D Ritta
To: carcia at sbcglobal.net
Sent: Thursday, October 23, 2008 3:01 AM
Subject: Re: [Premium-Rx] WJ AN/URR-74 help
Well I got it without cutting the leads out using of all some of my mothers perfumme applied using a firm paint brush.
Now I need to find a replacement.
Lee
----- Original Message -----
From: FRANCIS CARCIA
To: L D Ritta
Sent: Tuesday, October 21, 2008 10:38 AM
Subject: Re: [Premium-Rx] WJ AN/URR-74 help
Cut each lead of the IC and remove the package then 1 pin at a time. MEK should loosen it up. Auto paint thinner may also work.
--- On Mon, 10/20/08, L D Ritta <ufp at optusnet.com.au> wrote:
From: L D Ritta <ufp at optusnet.com.au>
Subject: [Premium-Rx] WJ AN/URR-74 help
To: premium-rx at mailman.qth.net
Date: Monday, October 20, 2008, 1:15 PM
Hello Everyone
This is the next installment of the saga to repair my display board for the WJ AN/URR-74.
What do you use to remove the conformal coating, as I have desoldered the U8 chip.
It is stuck there. Any ideas?
73 Lee
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Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv at amsat.org AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
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