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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 darlingtons so this is just killing time on a rainy day.

I have an MCT61. I haven't been able to figure out the datasheet since it seems

to list things in a different way. The?datasheet is probably fine, it's just I have virtually no experience with optocouplers.

So using the DATA DIN on the back of my 850 and 870 I need to keep the current draw on that DIN under 10 mA so my target is 6 mA.?

I made a voltage divider?to keep the voltage down to the opto and also keep the current down on the radio's 12 volt supply. I did hit my target of 6 mA and also I measured 6 mA on the diode side of the opto but on the transistor side of the opto?

I measured 85 ohms from C to E when turned on so I feel the?opto was not completely turning on the transistor side. I was hoping to see zero ohms when turned on, not 85 or so.

What I was going to do next is use a regular switching BJT driven by the transistor

side of the opto to do the amplifier keying/switching. I haven't got to that part of this

experiment yet but my gut feeling is I don't have the correct optocoupler for this

project. Again I need to keep the current draw on the Kenwood radio's DIN plug at 6mA so my thinking is I need an opto that will completely saturate the transistor side with 6mA current on the diode side and it doesn't look like what I have can do that.

Again, this is just for fun but if I'm successful?I'll make one for my amps.

Am I on the right track?

Thanks for reading.

Bob W4JFA