On Fri, 20 Feb 2004 03:08:14 GMT, "Jim Pennell"
wrote:



I'd be tempted to use a PAL chip. It is possible to make a multiply by 4
and then divide by 10 in the same chip, which would make the total parts
required to get the 4 MHz 50% Sq Wave your original 10 MHz input and a
single chip.


Mice one Jim.
1. buy your PAL programmer
2. buy your PAL
3. learn how to obtain the required function
4. burn the PAL and discover it does'nt work
5. while patience lasts go to 2. wend
6. revert to PLL

On Fri, 20 Feb 2004 09:56:22 GMT, (Mike W) wrote:

On Fri, 20 Feb 2004 03:08:14 GMT, "Jim Pennell"
wrote:



I'd be tempted to use a PAL chip. It is possible to make a multiply by 4
and then divide by 10 in the same chip, which would make the total parts
required to get the 4 MHz 50% Sq Wave your original 10 MHz input and a
single chip.


Mice one Jim.
1. buy your PAL programmer
2. buy your PAL
3. learn how to obtain the required function
4. burn the PAL and discover it does'nt work
5. while patience lasts go to 2. wend
6. revert to PLL

I could do the same analysis for a PLL - it isn't a two minute job.

Do you have a problem with an XOR chip and a 74(xx)90?

On Fri, 20 Feb 2004 09:56:22 GMT, (Mike W) wrote:

On Fri, 20 Feb 2004 03:08:14 GMT, "Jim Pennell"
wrote:



I'd be tempted to use a PAL chip. It is possible to make a multiply by 4
and then divide by 10 in the same chip, which would make the total parts
required to get the 4 MHz 50% Sq Wave your original 10 MHz input and a
single chip.


Mice one Jim.
1. buy your PAL programmer
2. buy your PAL
3. learn how to obtain the required function
4. burn the PAL and discover it does'nt work
5. while patience lasts go to 2. wend
6. revert to PLL

I could do the same analysis for a PLL - it isn't a two minute job.

Do you have a problem with an XOR chip and a 74(xx)90?

On Fri, 20 Feb 2004 09:56:22 GMT, (Mike W) wrote:



Mice one Jim.
1. buy your PAL programmer
2. buy your PAL
3. learn how to obtain the required function
4. burn the PAL and discover it does'nt work
5. while patience lasts go to 2. wend
6. revert to PLL


Well, true... Happens I have access to that sort of thing, but I do see
your point.

Another approach might be to divide by 5 and then you can double twice
with a couple of chips, and then divide by 2 to get the 50% duty cycle.

A PLL system works, but for something this simple a couple of generic glue
logic IC's will serve the purpose.

Let me see, it'd require a 7490, a hex inverter for some delay in the
multiplier, and a 7400 nand. If memory serves, that ought to do it.


Jim Pennell
N6BIU

On Fri, 20 Feb 2004 09:56:22 GMT, (Mike W) wrote:



Mice one Jim.
1. buy your PAL programmer
2. buy your PAL
3. learn how to obtain the required function
4. burn the PAL and discover it does'nt work
5. while patience lasts go to 2. wend
6. revert to PLL


Well, true... Happens I have access to that sort of thing, but I do see
your point.

Another approach might be to divide by 5 and then you can double twice
with a couple of chips, and then divide by 2 to get the 50% duty cycle.

A PLL system works, but for something this simple a couple of generic glue
logic IC's will serve the purpose.

Let me see, it'd require a 7490, a hex inverter for some delay in the
multiplier, and a 7400 nand. If memory serves, that ought to do it.


Jim Pennell
N6BIU

Anyone care to nominate an RF mixer chip for 100Mhz that's readily
available in the UK?
--

The BBC: Licensed at public expense to spread lies.

Anyone care to nominate an RF mixer chip for 100Mhz that's readily
available in the UK?
--

The BBC: Licensed at public expense to spread lies.

Paul Burridge wrote in message
...

Anyone care to nominate an RF mixer chip for 100Mhz that's readily
available in the UK?
--

The BBC: Licensed at public expense to spread lies.

LM1496

Paul Burridge wrote in message
...

Anyone care to nominate an RF mixer chip for 100Mhz that's readily
available in the UK?
--

The BBC: Licensed at public expense to spread lies.

LM1496

On Sat, 21 Feb 2004 12:28:13 +0000, Paul Burridge
wrote:


Anyone care to nominate an RF mixer chip for 100Mhz that's readily
available in the UK?


give 'em a call for free samples...


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