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Re: [Amps] Actuating a 120 VDC relay with low voltage

To: amps@contesting.com
Subject: Re: [Amps] Actuating a 120 VDC relay with low voltage
From: Paul Kraemer <elespe@lisco.com>
Date: Mon, 26 Dec 2022 20:16:45 -0600
List-post: <mailto:amps@contesting.com>
FWIW Jeff at Harbach no longer has the keyer.  I have one and wish I could get another.  I also have used the Ameritron ARB version.  Recently found yet another one on ebay it is a simple relay in a box with RCA connectors.  Now THAT is simple.

Paul K0UYA

On 12/26/2022 4:47 PM, gudguyham--- via Amps wrote:
Use a Harbach soft key for an SB220 or use mine.


Sent from the all new AOL app for iOS


On Monday, December 26, 2022, 5:04 PM, Steve London <n2icarrl@gmail.com> wrote:

I have an old PT-2500A with a 120 volt relay. Modern radios don't like such
a high voltage on their PTT circuit.

Can someone point me to a circuit that will allow control of the 120 volt
PTT relay with something in the 12-24 volt range ? Seems like it should be
pretty simple with a transistor that can handle 120 volts collector to
emitter, but I would rather have a tried-and-true circuit so I don't screw
something up.

Thanks and 73,
Steve, N2IC
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