Hi Josh,
Instead of resistors, try diodes in series. Each Diode will drop your
voltage. I have series a couple to get rid of standing voltage, especially
if you are down to a half volt or so.
73 JIM
On Mon, Jun 21, 2010 at 11:57 AM, Josh josh.kit...@gmail.com wrote:
I've been fighting this
At 08:57 AM 6/21/2010, Josh wrote:
When the squelch is closed, I get right around 8 volts, taken from
pin 8 of the modified mobile audio/squelch board - the tried and
true process just about everybody uses. When the squelch opens,
I'm at not ground potential, but right about half a volt.
: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of James Cicirello
Sent: Monday, June 21, 2010 12:43 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Micor COS issues continuing
Hi Josh,
Instead of resistors, try diodes in series
I always use an NPN transistor (2N4401 or whatever floats your boat) as an
inverter on the Micor COR, with a voltage divider on the base. Micor COR
to base through 10K, 4.7K from base to emitter, ground emitter, collector
becomes active-high COR. Pull up collector with 12V through 1K (or
Hi Josh,
You can mod your Micor, but you'll keep running into similar problems when you
interface your controller with other repeaters. COR outputs can be driven by
Darlington transistors, LED drivers, squelch ICs, etc., and not all will go as
low as you want.
Here's how we've designed our
Here's how we've designed our controllers' COR, CTCSS, and
logic inputs for many years: Feed the COR signal to the top
of a voltage divider. The upper resistor is 10K and the lower
is 4.7K. Feed the junction of the divider to the base of an
NPN such as a 2N3904, 2N, etc. You'll
Hi Jeff,
Here's how we've designed our controllers' COR, CTCSS, and
logic inputs for many years: Feed the COR signal to the top
of a voltage divider. The upper resistor is 10K and the lower
is 4.7K. Feed the junction of the divider to the base of an
NPN such as a 2N3904, 2N, etc.
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