Tesoro vbreak mod help.

[grizzly]

I would like to add a variable tone break feature to my tesoro compadre. I would like to have a knob that i can adjust to split a high and low tone change point. The knob could be marked like a Disc knob. Just turn it to point at the point where you want the break to be. I can build just about anything but I dont know how to design such a circuit. Hoping one of you awesome Gurus could help me out on this.

[Silver Dollar]

Well here's 2 tone mod I was planning on using in my Bandito.
You may have to change the MAX333 I was using it as it has
4 switches and you only need 1 (but it has to be DPDT).

[grizzly]

Thanks, I have a question what would you replace the max333 with. Like I said I am not really good at engineering just building. I was planning on building a Bandito 2 umax from the schematic on this fourm. I have most of the parts but it doesnt look like I will be building it anytime soon. I have 2 NTE4066b from that project.

[Silver Dollar]

Well a 4066 is single pole single throw. A 4053 is a double pole. The idea is to use one of
the clock outputs from the 4024 when the GEB channel is positive and a different one
when negative. So that switch chooses the tone.

[grizzly]

Ok, I will go pick one up and give it a try. After looking at your schematic I decided that I am not as smart as I thought I was. Just making sure GEB is the output of the disc pot, and the pot R47 is where I would adjust the break point? Thanks

[Silver Dollar]

You would adjust it on R49 on the add in pcb and the GEB line would go to u105 pin 6 or u106b pin 5 on this schematic;


I don't think the Compadre schematic was ever shown so you have to figure out where that point is on your machine.

The circuit should be pretty similar to this schematic.

[grizzly]

Thanks, you are awesome. I hope this is enough for me to be able to figure this out. I put R47 when I meant R49. I think I need to go take some electrical engineering classes.

[Silver Dollar]

Well it's a easy project to start with. If you run into trouble just ask for some help.

I have a schematic that's supposed to be the Compadre though I have my doubts;


A good picture of the board will help too. I have one picture but its a bit blurry so
hard to use.

[scrungy_doolittle]

Well here's 2 tone mod I was planning on using in my Bandito.
You may have to change the MAX333 I was using it as it has
4 switches and you only need 1 (but it has to be DPDT).
[ATTACH]31607[/ATTACH]

Why is the diode there. Isn't this an output, and won't a diode completely block the output to the sound? I would understand this, if it was pointing the other way...
I'm not an electronics guru just a firmware guru with some electronic knowlege.

[Silver Dollar]

Well you have to look at the rest of the circuit. The "output" is an envelope that is chopped
by the signal on the cathode side of the diode.

[grizzly]

Well you have to look at the rest of the circuit. The "output" is an envelope that is chopped
by the signal on the cathode side of the diode.

Wow, That means almost nothing to me. The more I try to understand, the more I realize I dont understand. Its frustrating.
Here is a link to some compadre schematics and photos. This may be the same photo you have its not great. I can id any of the components if needed. http://www.geotech1.com/forums/showt...light=compadre
I am having trouble understanding which pinouts to use on the 4053. http://www.ti.com/lit/ds/symlink/cd4051b.pdf It looks like it has multipull switches I dont know which I need? I lack the knowledge about how this works. If someone tells me where to connect I can solder it up nicely. But I cant really addlib. I can follow a schematic if I dont have to change anything. Thanks

[Silver Dollar]

Here's a picture to help you understand. The 4053 has 3 switches. Each has a common and two switched contacts.
The single letter pin is the control pin.

[grizzly]

Thanks, I am starting to understand this a little better. Where do I connect the out to sound? Does it go direct to the speaker or do I tie into the circuit?

[Silver Dollar]

Well here is the EDU schematic with the 4053 added in you would still need the other chip to control it...


There also was some info on 2 tones in the TGSL thread. There is a pcb available form silverdog;
http://www.silverdog.co.uk/shop/inde...product_id=132

And a modified schematic;

[grizzly]

Thanks, all the voltages appear to be +5v or -5v. Are these required or can I use other voltages. Specifically, I found a 4.55v free contact for the positive and ground for the -. Sorry I keep asking so many questions, I dont want to fry my detector.