Giantkiller moves forward into Full Heterodyning.

[giantkiller]

GK i would be interested to know the built spec of you mosfet amps now you completed them. What is the bandwidth? Do they have any high frequency birdies? do they run up to 1 meg with XR's with ease? If not they may not be suitable to bother others replicating that circuit.

Min max titles are missing.
Max. Operating Frequency 0.5 1 0.5 1 MHz C = 1000pF, R1 = 1k
Lowest Practical Frequency 0.01 0.01 Hz C = 50F, R1 = 2M
Frequency Accuracy +1 +4 +2 % of fo fo = 1/R1C

Temperature Stability
Frequency
+10 +50 +20 ppm/?C 0?C
TA
70?C
R1 = R2 = 20k
Sine Wave Amplitude Stability2 4800 4800 ppm/?C
Supply Sensitivity 0.01 0.1 0.01 %/V VLOW = 10V, VHIGH = 20V,
R1 = R2 = 20k
Sweep Range 1000:1 2000:1 2000:1 fH = fL fH @ R1 = 1k
fL @ R1 = 2M

Sweep Linearity
10:1 Sweep 2 2 % fL = 1kHz, fH = 10kHz
1000:1 Sweep 8 8 % fL = 100Hz, fH = 100kHz
FM Distortion 0.1 0.1 % +10% Deviation

@Bolt,
You are absolutely right here. That is the dark side of open source. People are looking for a foothold to start somewhere.
And,
When heterodyning, any 3 frequencies can produce the low beat frequency (thump/wump) and of greater amplitude in the harmonic or standing wave position.
But we know this. We only match the frequencies to the diameter and turns of our coils.

@Marco,
At the flick of a switch I can change from sine to triangle or square. I adjust the gain of the triangle waves and clip the peaks to get the slope function.
Totally open operation.

@all,
This next idea was bandied about but never posted and is pretty easy. Take a TPU and hook it up in the Solid state Tesla Coil / blocking osc circuit. Few parts, concise, pretty basic. Not too complex or beyond anybody here. Parts count seems to be right. Even the power requirements seem to be right on. You can even swipe it with a magnet! Shades of Bedini / Muller. Magnetic shearing creates great pulses. But alas, mechanical.

--giantkiller.

[innovation_station]

well i went and got the little guy tonight i will take it apart 

ist

[bolt]

So in summary you are happy with the XR and mosfet amps? The important part is do the mosfet amps cope well at 1 meg to cover the XR range and if they do it well then you have completed what you set out to achieve. I am not sure if you are quoting me the data specs for the XRs or the actual capability of a near DC to 1 meg sig gen with the mosfet that runs through the range without birdies.

Also a music test, do the amps sound great like the author says ?

[giantkiller]

The heterodyned harmonics are there in the bucket test. Very rich for the frequency response of the speakers. You can hear the vibrato at any set you can find and it is clear. I gave you the chip specs. The kit doesn't go that high because of the caps in it. I have already thought about that mod. I will be able to test the higher ranges against the coil itself. I am repairing the fire damage then will continue on.

--giantkiller.

[acerzw]

@freaky amp fans...

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Acerzw