> The question is, which frequency difference is really required to
> prevent the locking.
The other tricky bit is that the "beat" frequency needs to be slow
enough to be visible.
At this point, I don't think I'm going to worry about it any more.
I've redesigned the board to accept caps in eith
Hi DJ,
On Sunday 17 September 2006 23:18, DJ Delorie wrote:
> > When I'm using 7414 as oszillator I usually use the third circuit.
> > This only works with IC's that have schmitt-trigger inputs.
>
> The board with this oscillator does the same thing :-(
> (but much faster; 2.2 kHz instead of 400 H
Hi DJ,
sorry for the late response, I had a really nice vacation :-)
On Friday 15 September 2006 06:08, DJ Delorie wrote:
> > When I'm using 7414 as oszillator I usually use the third circuit.
> > This only works with IC's that have schmitt-trigger inputs.
>
> Question: does it matter what the ot
> When I'm using 7414 as oszillator I usually use the third circuit.
> This only works with IC's that have schmitt-trigger inputs.
The board with this oscillator does the same thing :-(
(but much faster; 2.2 kHz instead of 400 Hz)
I suppose I could put one of each oscillator on the board. They
> When I'm using 7414 as oszillator I usually use the third circuit.
> This only works with IC's that have schmitt-trigger inputs.
Question: does it matter what the other side of the capacitor is
connected to? It would be convenient if I could tie one of them to
GND, and the other to Vcc, becaus
John Luciani wrote:
Here we go... Do you have the manual for the etherwave? Last paragraph
of the left column of page 6. Basically the 2 caps which combine the
fixed frequency oscillator and the variable frequency oscillator for the
pitch circuit not only combine the signals into the mixer, t
On 9/13/06, Dan McMahill <[EMAIL PROTECTED]> wrote:
John Luciani wrote:
> On 9/12/06, Dan McMahill <[EMAIL PROTECTED]> wrote:
>
>>
>> John Luciani wrote:
>> > On 9/12/06, Dan McMahill <[EMAIL PROTECTED]> wrote:
>> >> al davis wrote:
>> >> > On Tuesday 12 September 2006 22:32, Dan McMahill wrote:
John Luciani wrote:
On 9/12/06, Dan McMahill <[EMAIL PROTECTED]> wrote:
John Luciani wrote:
> On 9/12/06, Dan McMahill <[EMAIL PROTECTED]> wrote:
>> al davis wrote:
>> > On Tuesday 12 September 2006 22:32, Dan McMahill wrote:
>> >> Some TV's used injection locking
>> >> for some of the sync c
On 9/12/06, Dan McMahill <[EMAIL PROTECTED]> wrote:
John Luciani wrote:
> On 9/12/06, Dan McMahill <[EMAIL PROTECTED]> wrote:
>> al davis wrote:
>> > On Tuesday 12 September 2006 22:32, Dan McMahill wrote:
>> >> Some TV's used injection locking
>> >> for some of the sync circuits.
>> >
>> > All
John Luciani wrote:
On 9/12/06, Dan McMahill <[EMAIL PROTECTED]> wrote:
al davis wrote:
> On Tuesday 12 September 2006 22:32, Dan McMahill wrote:
>> Some TV's used injection locking
>> for some of the sync circuits.
>
> All of them, back in the tube days.
>
Oh, and I forgot one which John sho
On 9/12/06, Dan McMahill <[EMAIL PROTECTED]> wrote:
al davis wrote:
> On Tuesday 12 September 2006 22:32, Dan McMahill wrote:
>> Some TV's used injection locking
>> for some of the sync circuits.
>
> All of them, back in the tube days.
>
Oh, and I forgot one which John should appreciate. Isn't
> 0.1 V? Looks like way too much - I wouldn't accept more than 0.01V or less
> at the consumption those chips have... Even 1 mV DC fall is really to
> much!
>
> If there _is_ a 0.1V drop, I'd check those power lines again.
No, I meant the logic signals are all within 0.1v of vcc/gnd. Vcc
itself
> Did you measure this? Not even a blip of current? (I should say,
> *can* you measure it, since the lock is so sensitive.)
Might be a blip, I'll have to switch to faster gear to measure it.
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On Mon, 11 Sep 2006 13:58:02 -0400
DJ Delorie <[EMAIL PROTECTED]> wrote:
>
> > Check output amplitude - they'll be different in that case.
>
> Nope, all signals are 0-5v, no more than 0.1v off the power rails. I
> resoldered the vcc and gnd pins anyway, no change.
>
0.1 V? Looks like way too
On 9/12/06, DJ Delorie <[EMAIL PROTECTED]> wrote:
> I notice the LED ground current is sharing a trace with the
> oscillator. Perhaps that is contributing to the oscillators locking?
When the two oscillators are in sync, the leds aren't blinking at all,
so the ground current is constant.
Di
> I notice the LED ground current is sharing a trace with the
> oscillator. Perhaps that is contributing to the oscillators locking?
When the two oscillators are in sync, the leds aren't blinking at all,
so the ground current is constant.
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On 9/12/06, DJ Delorie <[EMAIL PROTECTED]> wrote:
> Did you post the schematic for this before? I'm not finding it.
http://www.delorie.com/pcb/smd-challenge/smd-challenge.sch
http://www.delorie.com/pcb/smd-challenge/smd-challenge-sch.png
http://www.delorie.com/pcb/smd-challenge/smd-challenge.p
al davis wrote:
On Tuesday 12 September 2006 22:32, Dan McMahill wrote:
Some TV's used injection locking
for some of the sync circuits.
All of them, back in the tube days.
Oh, and I forgot one which John should appreciate. Isn't the pitch
oscillator on a theremin usually tuned to injecti
> Did you post the schematic for this before? I'm not finding it.
http://www.delorie.com/pcb/smd-challenge/smd-challenge.sch
http://www.delorie.com/pcb/smd-challenge/smd-challenge-sch.png
http://www.delorie.com/pcb/smd-challenge/smd-challenge.pcb
http://www.delorie.com/pcb/smd-challenge/smd-chal
On Tuesday 12 September 2006 22:32, Dan McMahill wrote:
> Some TV's used injection locking
> for some of the sync circuits.
All of them, back in the tube days.
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On 9/12/06, DJ Delorie <[EMAIL PROTECTED]> wrote:
> I think the only real cure is 2 packages with attention being paid to
> decoupling their supplies from each other.
The scary part is how well it works with a big DIP inverter, although
that one is CMOS.
Did you post the schematic for this b
> I think the only real cure is 2 packages with attention being paid to
> decoupling their supplies from each other.
The scary part is how well it works with a big DIP inverter, although
that one is CMOS.
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DJ Delorie wrote:
However, the two oscillators tend to self-synchronize. If I let it
run, one LED is on and the other is off. If I put scope probes on the
buffered outputs (pins 6 and 8), I can see that the oscillators are
running, they're just in lock-step. Not even out of phase.
If I put a
> Check output amplitude - they'll be different in that case.
Nope, all signals are 0-5v, no more than 0.1v off the power rails. I
resoldered the vcc and gnd pins anyway, no change.
I'm going to try Werner's third circuit this weekend, see if the esd
draw is the problem.
_
On Sun, 10 Sep 2006 23:29:10 -0400
DJ Delorie <[EMAIL PROTECTED]> wrote:
> If I put a scope probe on either feedback line (pins 1 or 13), they
> drop out of sync and the two LEDs pulse back and forth (about 17Hz).
This seriously looks like a missing GND or VCC. You might be supplying
one of the c
> You can just remove it if you don't need exact symmetry.
I'll try a board with it removed. I don't care about symmetry, just
"something functional with the least number of parts".
> R2 is usually 10 times larger than R3.
Ok, thanks.
> Why in hell do you use such damn small parts ;-).
That'
Hi DJ,
On Monday 11 September 2006 16:42, DJ Delorie wrote:
> Werner Hoch <[EMAIL PROTECTED]> writes:
> > When I'm using 7414 as oszillator I usually use the third circuit.
> > This only works with IC's that have schmitt-trigger inputs.
>
> What values (or ratios) of R3 and R2 do you use?
Depen
Werner Hoch <[EMAIL PROTECTED]> writes:
> When I'm using 7414 as oszillator I usually use the third circuit.
> This only works with IC's that have schmitt-trigger inputs.
What values (or ratios) of R3 and R2 do you use? I assume R2 is
large, since it's configured as a voltage divider, but I'm t
> See the schematic for the current pathes.
ups no schematic, added now.
Regards
Werner
smd-challenge.sch
Description: application/sch-geda
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On Monday 11 September 2006 05:29, DJ Delorie wrote:
> I've got the prototype all soldered up. Took about six hours,
> including microscope inspection, mostly for the 01005's.
[...]
> However, the two oscillators tend to self-synchronize. If I let it
> run, one LED is on and the other is off.
On Sun, Sep 10, 2006 at 10:49:09PM -0700, Samuel A. Falvo II wrote:
> On 9/10/06, DJ Delorie <[EMAIL PROTECTED]> wrote:
> >However, the two oscillators tend to self-synchronize. If I let it
> >run, one LED is on and the other is off. If I put scope probes on the
> >buffered outputs (pins 6 and 8)
On 9/10/06, DJ Delorie <[EMAIL PROTECTED]> wrote:
However, the two oscillators tend to self-synchronize. If I let it
run, one LED is on and the other is off. If I put scope probes on the
buffered outputs (pins 6 and 8), I can see that the oscillators are
running, they're just in lock-step. Not
I've got the prototype all soldered up. Took about six hours,
including microscope inspection, mostly for the 01005's.
The design "works". I say "works" because the oscillators oscillate
(about 400Hz), the xor gates xor, the led drives work just fine,
although I could have used larger resistors
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