[time-nuts] Austron/ Systrom Donner 8181 Time Code Reader

Artek Manuals Manuals at ArtekManuals.com
Sun Apr 23 17:50:50 EDT 2017


If you know the Zener voltage and the supply voltage then calculating a 
reasonable value for the series resistor is pretty straight forward


On 4/23/2017 2:31 PM, Dave Wood wrote:
> Bill, actually what happened is the zener diode that the resistor fed
> shorted and that's the reason it burned up.  I have two units with this
> issue and I cannot read the resistor value since it burned up.  What I
> would love to know is what the original value of the dropping resistor
> was?  73  Dave
> On Sat, Apr 22, 2017 at 11:39 PM, Bill Hawkins <bill.iaxs at pobox.com> wrote:
>> There is usually a power dissipation reason why a resistor becomes
>> toast, and the reason is frequently a shorted bypass cap or a shorted
>> device.
>> Have you measured the resistance to ground of the end of the resistor
>> opposite the power supply?
>> Sometimes inputs get high voltages and short the amplifying device.
>> Sometimes that is reason the units were for sale.
>> Hope I'm wrong.
>> Bill Hawkins
>> -----Original Message-----
>> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Dave
>> Wood
>> Sent: Saturday, April 22, 2017 8:43 PM
>> Anyone on the list own the above Time Code Readesr.  I have one of each,
>> they are identical with the same issue.  I need to identify the correct
>> value of a resistor in the power supply that provides 27 volts to the
>> input amp.  They are both toast in my units and I do not have a manual.
>> Thanks in advance!  Dave _______________________________________________
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/
>> mailman/listinfo/time-nuts
>> and follow the instructions there.
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

Manuals at ArtekManuals.com

This email has been checked for viruses by Avast antivirus software.

More information about the time-nuts mailing list