Panacea-BOCAF 2nd MRA replication -COP =8

[duff]

It seems the XR2206 and ICL8038 are either extremely difficult to find or very expensive, which makes them a bad choice for sine generators.

Does the drive need to be sine wave?

It would sure simplify things if a triangle or square wave would do the job.

Could you test with your generator set to square wave instead of sine and see if the results are similar?

.99

@ Ash & Poynt99

I've found the XR2206 in stock at the following:

Mouser Electronics
$7.79 - http://mouser.com/search/ProductDetail.aspx?qs=H%252bP%2fcHWii3cm1aCPniRXbw%3d%3d
$ 7.29 - http://mouser.com/search/ProductDetail.aspx?qs=H%252bP%2fcHWii3dGXk0dx06osA%3d%3d

JDR Microdevices
$3.25 - http://www.jdr.com/interact/item.asp?itemno=XR2206


Future Electronics
$2.62 - http://www.futureelectronics.com/en/technologies/production-products/test-measurement/function-generators/Pages/3238037-XR2206CP-F.aspx
$2.60 - http://www.futureelectronics.com/en/Technologies/Product.aspx?ProductID=XR2206DFEXAR4075065


-Duff

[ashtweth_nihilisti]

Duff thanks a lot man, this circuit will also be sent to Norman Wootan if working okay.
Thanks again man.

Ash

[poynt99]

Duff,

I checked these two chips earlier today and knowing then that current consumption is of prime importance in this application, I was hoping that square waves would do the job (as Ash and Andrew have just confirmed), so that a CMOS chip could be proposed for the oscillator design.

The 2206 and 8038 consume about 5mA with a supply of 10V, or about 50mW of power. The CMOS oscillator I've agreed to design shouldn't use any more than 100uA (900uW with a 9V source) or so when idling (i.e not driving any load) , so the only real power used from it will be to drive the MRA--the 80mW output with 600 Ohm output impedance.

Good to know that these chips can be found still at a reasonable price. The ones I found were in the range of $50 ea.

.99

[poynt99]

Hi poynt99 ,

Okay, the 20 LED circuit was operating at 16-17Khz on a square wave ( i would make the range 20-25Khz encase)
So what we really need is a variable frequency(to tune to resonance) and a fixed duty cycle of 50% - Can be Square wave

Andrew thinks this is the only way it will work. As even changing the leads length and plugging in another circuit, changes the resonant parameters, that's why it may be a higher freq or lower form the driver circuit after removing the signal Gen..(make a higher range please) this is one sensitive device.Joel and Norm have told me about how the moons gravity and Sun effect the out puts.

Ash

I'll try to work it so you've got roughly 10 kHz (min setting) to 30 kHz (max setting) range, if that suits you.

.99

[ashtweth_nihilisti]

Hi poynt99, this sounds great man, should be fine we will keep this MRA for your circuit, am going to wind a bigger one next weekend, strangely, the more winds the higher the impedance, so it went down to the audio range after bigger windings. The first one was 70Khrtz, this one went down to 16-20Khz

Ash