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On Tue, Jan 14, 2025 at 07:05 AM, Jim VE7RF wrote: > > I used an opto-22? ?opto isolator.? You can get em in 5 vdc.....15 > vdc...and 24 vdc? on the input side....... (and each of those 3 x >

WB2FKO said: "Keeping with GM3SEK's original design philosophy, the boards could be re-engineered with a modern microcontroller that could also implement a versatile sequencer function, thermal

Henry 2K-3 Bob W4JFA <bob.herendeen@...> wrote:

Jim, Thank you. When studying this, most optocoupler diagrams show 3 connections, VCC, OUT, GND/NEG. For amplifier keying there's only two wires, POS and NEG which need to be connected to key the amp.

I used an opto-22? ?opto isolator.? You can get em in 5 vdc.....15 vdc...and 24 vdc? on the input side....... (and each of those 3 x different input vdc's is nominal...... IE:? u can go a LOT

Just wondering Bob, what kind of amplifiers do you have?

That's ok. I got it working. These interfaces have a few advantages. It uses the 12 volts from the radio as long as I stay below 10 mA. 12 volts on transmit from the Kenwood's DIN accessories jack. In

I have a set of tetrode boards on my GS23B amplifier and understand the design pretty well. Their primary functions are voltage regulation and screen current trip, which has saved me countless times

Thanks for that insight, Reid. With all that being said, the electronic methods for control and protection of triode and tetrode amplifiers haven't changed....Ian's circuits, from an electronics

I was reminded there is another source for boards to use with a triode OR tetrode, one built in France A couple of years ago I was in a discussion about using one of them on a larger tetrode in

I contacted a friend of Ian's and he dialed him up and asked to comment on the subject at hand. Ian said he basically was unable to help, here's his reply "There have been a few inquiries about

My Fault Bob, I thought you had an HL-2200, that is Rons comment. Sorry for the confusion. Bob N9NRW

You could just use the sb-220 softkey circuit and eliminate the need for the external power. I stuck it on a strip board.

It looks like my drawing will work. I used a 2N2222 to switch it. This is done on a perf board only. The amp keying is 25 volts @ 60 mA so I'll have to determine the 2N2222 base resistor. I'm

Ron, Thank you. I'm trying to learn these optocouplers so I need to figure out on my own. Attached is my drawing. After looking around I may order a few 4N25's. Bob

Years ago Gary made a relay-driven protector when it was seen that a large RF signal could damage the circuitry of the transceiver's RX2 port. It turned out to be an excellent RF amplifier keying

Another simple almost complete interface costing a few $$:? An Arduino 12V relay module.? It has an optoisolator input driving a reed relay.? 12V power, and a couple cables are all that's needed to

Hi all, Since I'm now retired I have time to goof off. I was trying to design an amplifier keying interface using an optocoupler. I don't need one since I already built a few using BJT's and/or

The Art Work for the PCBs is the property G3SEK. The circuitry is nothing special and is Public Domain. Using any one of the popular PCB Design CAD Programs (Altium Designer/Circuit Studio/Maker),

Hullo Tracey and the Group, Does anyone chat about with Ian, GM3SEK? He's a member of the Oxford University Radio club, and still active on VHF, I believe. Perhaps he might "Pass along the ball"