AVR+DSS Frequency Mod SD2100V2

[Jiminy]

Excellent. Can't wait to hear how they turn out!


/r
jiminy

[mario]

I got my boards!

And this time, I found no problems. I'll try to assemble a working unit by the end of the week.

[IBGold]

Jiminy,

Most problems seem to come from broken wires when moving boards around with the 2000, I am also still a Ham but not that active any more and some of my equipment still run valves that give you an idea of my age Hi VK5KIB.

Regards, Ian.

[Jiminy]

Gef, thanks for the heads up and assistance. That was going to be the next step after checking the power supplies. I've already had one wire break, but that was the battery supply wire. Corrected that. Will keep on plugging. From your sig, I take it you are an amateur radio operator. I had a licence years ago. Advanced class. Didn't get to renew it in time so it expired. Most of my gear is REALLY old now. hahaha. Like me. . . . .

/r
Jonn

[Jiminy]

Ian, I finally got your email. Thanks. Did get the photo. I will check the +5 and -5v supplies. Will let you know the results.
/r
Jonn

[gef12]

Mario and All,

Sorry to hear about your plight with the PCB manufacturer. Hard to get good service these days. I often wonder how some of these companies stay in business with poor service. Keep me on the list for your board, whenever the situation gets resolved.


On my 2000, it looks like the only component that was changed was the IRF710. There was alot of the paint removed from the board also. (bet that was a real chore! hahaha)I talked with Woody awhile back, he recommended replacing the 2n7000 FET by the big CAPs, which I did. I did notice that the paint around the large CAPs was all yellowed so I ordered replacements for them. As I told Ian, the machine does nothing. The red LED just flickers once or twice when I turn it off. No sound whatsoever from the headset. I guess the next step is to go from the audio board test points towards the headset jack with a scope looking for any noise. I think putting any kind of speaker to the TPs would load down the circuit too much and not be fruitful. I would think that changing the tone and threshold should show some change at the TPs on the audio board. If so, that would be a plus. Maybe it's just a broken wire somewhere that is not showing itself to date.


v/r
jonn

Hi John
Those wires in the 2000 are quite feeble when moved around a bit .. so would check conectivity on them going from the boards to the front and back panels...
Gef

[IBGold]

Jonn,
Did you get my PM? for a start check if you are getting +5 and -5 volts in relation to VB+ we will take it from there.
Regards, Ian.

[Jiminy]

Mario and All,

Sorry to hear about your plight with the PCB manufacturer. Hard to get good service these days. I often wonder how some of these companies stay in business with poor service. Keep me on the list for your board, whenever the situation gets resolved.


On my 2000, it looks like the only component that was changed was the IRF710. There was alot of the paint removed from the board also. (bet that was a real chore! hahaha)I talked with Woody awhile back, he recommended replacing the 2n7000 FET by the big CAPs, which I did. I did notice that the paint around the large CAPs was all yellowed so I ordered replacements for them. As I told Ian, the machine does nothing. The red LED just flickers once or twice when I turn it off. No sound whatsoever from the headset. I guess the next step is to go from the audio board test points towards the headset jack with a scope looking for any noise. I think putting any kind of speaker to the TPs would load down the circuit too much and not be fruitful. I would think that changing the tone and threshold should show some change at the TPs on the audio board. If so, that would be a plus. Maybe it's just a broken wire somewhere that is not showing itself to date.


v/r
jonn

[mario]

Ok guys,

I'm very disappointed with my pcb maker.

I'm left on my own since the boards are as "specified" by the gerber data. I shouldn't be surprised considering that their online record is spotty within the hobbyist community. Their support really really sucks. They have not responded to my last emails.

I had chose them because I had read (somewhat) good things about their work. However, If you need pcbs done, don't ever use MyroPCB.

Anyways, I reworked my layout today. It will be weeks before I get my new pcbs.

I think you'll appreciate the changes.

Also Jonn, you might want to post pics of your board. What modifications did the previous owner try to install? Which ICs did he change, etc..

[IBGold]

Jiminy,

For the Modifications for the 2000 go to Ismael's site Minelabmods.com he has all the mods there well documented that you can download I will send you a PM with a picture of which resistor to remove I have mine switched and only switch it out when using frequencies below 1.25 MHz, I would think Mario's device would plug in on the center pin of the jumper-pins where you select which standard crystal you use and earth the same place as a multi crystal switch is connected and is explained in the 2000 mods this is the same as where my VCO is connected.

What are the symptoms of your 2000 what does it do or not do?

Regards, Ian.