Successful TPU-ECD replication !

[ronotte]

@ZPE,

If it may be of help to know  I'm currently almost finished the designing a Sync/Async triple oscillator programmable  (:3 - :9999)  just with DIP switches. The rationale is to use the Async mode to discover the 3 sweet freq and then switch to sync mode...with attention as I've already seen much more output when synched.  I'll post soon the complete design.

The unit is divided into 3 Subassembly:

1 - Assembly has a single little board containing the Master Oscillator (Xtal) and the 3 LSI CD4059 prog counter in serial connection. DIP Switches provide for: BCD freq progr., Mode progr, Load of setting, Asyn/Synch operation.

2 - Assembly are actually 3 very small board just to accomodate each the Mosfet driver and power Mosfet and his heathsink. The little board is designed to be set near the external Mobius ring.

3 - Assembly does contain only the 2 Mobius ring.

Roberto

[otto]

Hello all,

@Darren,

I totally agree with you. The point is, there are a lot of new people....not in electronics...

With 3 synchronised frequencies its muuuuch better and easier to work but if you have such a success as I had then there is no equipment anymore.
I wanted that the people first learn how to mix, whats going on with the current and voltage from the power supply and then synchronise the frequencies.

@Roberto

be careful.

Otto

[Peterae]

Another chip that may be of use is a binary rate mulitplier or BRM, 7497 or cd4089 although ive not gone that way yet myself so have no design.

Peter

[gn0stik]

I was going to wind a coil, but I don't have the #24 wire, so I decided to try and calculate the inductances.

What I came up with:

Primary: 15.5uH, 0.36 Ohms, [165.32 inches of #24 wire], 90 turns

Secondary: 107.8uH, 2.28 Ohms, [413.28 inches of #28 wire], 248 turns

I used a coil length of 1", and a starting bobbin diameter of 0.5".

Hopefully a few people will add their specs for comparison.

Regards,
Darren

Hi Darren, I will soon, my chips came in so I'm a bit distracted at the moment. I don't have the electronics experience some of these guys have so it's a little more challenging for me in the build stage, so when I get a chance I'll run the numbers for inductance.


Rich

[gn0stik]

Hello All,

I'm finally back from my weekend trip and thought I would take the time to draw up the the circuit diagram for my control circuit.

It uses the mic4427 MOSFET drivers for the IRF840 MOSFETs. For those of you wondering where to order them, they can be purchased inexpensively from this website here:

http://www.arrow.com/

Search for mic4427BN. That is the correct chip.

I am currently modifying my control circuit to output extremely small duty cycle square waves (500 ns pulse width) to conserve input power. My firm view is that we only want to put in enough current to load the coil inductance and no more. Any extra input will simply be wasted. The attached circuit diagram does not include the ICs I will be using for the pulse width control but I will be using the 74HC423N chip. It is a Dual retriggerable monostable multivibrator which, using a resistor and capacitor allows you to vary the output pulse width from a minimum of 75ns and up. The mic4427NB drivers need a minimum 500ns pulse width to turn on and off properly.

As soon as I have finished the modifications to the control circuit, I will post an updated circuit diagram.

The board I have currently runs on a single 9V battery and the input frequencies are controlled by three separate battery-powered function generators, which I bought from here:

http://www.electronickits.com/kit/complete/meas/fg500k.htm

They have a range of 1Hz to 1MHz. Above, 500k, the square wave output really breaks down but since the FET drivers are comparator driven, it won't affect the switching of the MOSFETs.

That should be all you need to make this circuit. If you want to use 555 timers, make sure that you put some capacitors in parallel with the power supply inputs to the timer chips because the FET drivers draw a lot of power when they are running. If you have any problems, PM me and I'll see what I can do to help you.

God Bless,
Jason O

Thanks Jason, I'll get on it tonight. Hope I have the caps and resisters, prolly have to get a couple rat shack grab bags of resisters, I think I have the caps.

Rich