Ok, got it, pin 8 is just a shunt diode. This clears things up.
W8XO
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open-collector driver should work just fine just as it is.
Let me know how it goes!
- Jeff, K6JCA
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of K6JEK
Sent: Tuesday, October 03, 2006 9:29 PM
To: Flexradio
Subject: [Flexradio] Amp won't unkey
The Flex
: Wednesday, October 04, 2006 3:32 AM
To: K6JEK; Flexradio
Subject: Re: [Flexradio] Amp won't unkey
Hi Jon,
I'm not familiar with the Ten-Tec Titan amp, but try disconnecting pin 8
from pin 7.
Pin 8 is the cathode connection for the protection diode in the SDR's
ULN2003 driver chip (and actually pin
Jon,
As Jeff said the pin 8 protection diode should not be needed for the
Ten-Tec Titan amp because of its transistor keying.
What is the other amp with the 12 volt DC relay? Does it have a back or
protection diode across the relay coil inside the amp? If it doesn't
have a back diode then
Anderson
Sent: Wednesday, October 04, 2006 6:38 AM
To: Jeff Anderson; K6JEK; Flexradio
Subject: Re: [Flexradio] Amp won't unkey
For completeness I should have added: you should only need to use two pins:
Pin 7 - connect to the Titan PTT connector center pin
Pin 15 - connect to Titan PTT
This is confusing to me. My kw's big 112 volt ac clapper relay is keyed
by an ice cube relay (12volt dc at apx 50ma.). The (+) lead from the 12
volt supply goes to the bottom of the ice cube relay coil. The (-) lead
from the supply is grounded. I key the kw by shorting the top lead from
the
Dave,
The pin 8 diode connection should go to the (+) side of the power supply
which in your description is also the bottom of the ice cube coil. The
top of the coil goes to pin 7. This puts a diode across the coil with
its cathode to the (+) side and the anode to the (-) side of the coil
7 matches
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