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 Post subject: Re: Guidance on building transmitter for a vintage game from
PostPosted: Jun Sat 27, 2020 2:43 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 902
Location: Sullivan, MO
Usually Lurking wrote:
The difficult parts are probably the coils. Those look like Newark stock numbers. Does anyone have a 1967 catalog handy?


They are J.W. Miller part numbers. The Oscillator coil is a 0.33uH choke:

https://www.electronicsurplus.com/j-w-miller-70f337ap-inductor-choke-coil-0-33uh-330nh-1-69-amp

The Audio coil is an adjustable 40-85uH unit. Look at PDF page 5 of this portion of the 1966 Miller catalog:

https://www.33audio.com/enter/data2/miller66adjust.pdf

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 Post subject: Re: Guidance on building transmitter for a vintage game from
PostPosted: Jun Tue 30, 2020 3:57 am 
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Location: Vancouver Island, Canada
Good point about the time delay, Richard. I've noticed that when locking the car from my living room, delayed flash of the tailights.

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 Post subject: Re: Guidance on building transmitter for a vintage game from
PostPosted: Jul Wed 01, 2020 10:54 pm 
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Speaking of time delay, the OP may have disappeared. <sigh>

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 Post subject: Re: Guidance on building transmitter for a vintage game from
PostPosted: Sep Thu 24, 2020 7:01 pm 
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Joined: Jun Sun 21, 2020 6:28 pm
Posts: 5
Location: Indiana, USA
I haven't disappeared, but I was certainly pulled away from this project for a bit. Still working on sourcing some parts. Someone asked about my skill levels, or at least hinted that it isn't a novice endeavor to make. For clarification, most of my experience is from repairing arcade motherboards. It is true that I am an analog novice, but I have the equipment and earnest necessary to build/tune these transceivers. On hand, I can CNC cut some copper-clad PCBs, and I have a desoldering station as well as a 50MHz oscilloscope.

I am extremely thankful though, that someone was able to identify which catalog those part numbers could be found in! I will check back in when some more progress has been made, but I'm kind of an overly cautious person when it comes to sourcing parts. I won't usually gamble on something if it isn't a sure thing, only when desperation sets in will I start gambling on whether a part is "good enough".

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