RESONANCE EFFECTS FOR EVERYONE TO SHARE

[gotoluc]

Hi All,

I'm sorry to report that my fixed oscillator switch (najman100 PCB) will not work as it is designed!

I have soldered up the PCB and tested the circuit today. First I found a design flaw, pin 16 on
the CD4009 was not connected to +12 volt. This is easy to correct, just solder a wire between
pin 1 and pin 16 on the IC.

After I corrected some soldering errors (mine) then I got the circuit as described in the drawing.
But, I encountered another problem, the crystal oscillator will NOT run. First I thought that I
had used a crystal frequency that was too high for the 4009 so I changed the crystal to 4 MHz
just to check. Still the oscillator did NOT run correct. I then rechecked the data sheet for
the CD4009 and saw that the IC does not have smith trigger inputs. So the oscillator will
not run with this IC no matter what I do.

The rest of the circuit performs well so I will modify the circuit to use an external oscillator input.
Attached is the updated drawings for such a circuit.

Again, I'm very sorry to have made such a huge mistake and wasted time for everybody.
As I said, the circuit will still work with an external oscillator from a signal generator.

Groundloop.

Hi Groundloop,

the board looks great ... I'm sorry to hear it's not working as you had thought.

Thanks for letting us know so quickly and offering a solution.

Luc

[najman100]

Hi All,

I'm sorry to report that my fixed oscillator switch (najman100 PCB) will not work as it is designed!

I have soldered up the PCB and tested the circuit today. First I found a design flaw, pin 16 on
the CD4009 was not connected to +12 volt. This is easy to correct, just solder a wire between
pin 1 and pin 16 on the IC.

After I corrected some soldering errors (mine) then I got the circuit as described in the drawing.
But, I encountered another problem, the crystal oscillator will NOT run. First I thought that I
had used a crystal frequency that was too high for the 4009 so I changed the crystal to 4 MHz
just to check. Still the oscillator did NOT run correct. I then rechecked the data sheet for
the CD4009 and saw that the IC does not have smith trigger inputs. So the oscillator will
not run with this IC no matter what I do.

The rest of the circuit performs well so I will modify the circuit to use an external oscillator input.
Attached is the updated drawings for such a circuit.

Again, I'm very sorry to have made such a huge mistake and wasted time for everybody.
As I said, the circuit will still work with an external oscillator from a signal generator.

Groundloop.

No worries i have a suggestion is it possible to make only the h bridge PCB with the optocouplers  so it will be the update of your first Gotoluc design .
Hope that the other design will work with the pic .

Najman

[Groundloop]

@najman100,

Yes. You can use the PCB you made as it is.

Don't solder the 4040 IC.
And don't solder the xtal and components around the xtal.
Then you solder a wire from pin 4 on the 4040 area to a external connector.
Also solder a ground wire (pin 8 at the 4040 area) to the connector.

Solder a wire between pin 1 and pin 16 on the 4009 IC.
Solder a wire from pin 11 to ground on the 4009 IC.

The circuit will then run with the same output frequency as you use on the signal generator.
Maximum input frequency is approx. 500kHz. (That is all the H11D1 can take.)

Groundloop.

[najman100]

@najman100,

Yes. You can use the PCB you made as it is.

Don't solder the 4040 IC.
And don't solder the xtal and components around the xtal.
Then you solder a wire from pin 4 on the 4040 area to a external connector.
Also solder a ground wire (pin 8 at the 4040 area) to the connector.

Solder a wire between pin 1 and pin 16 on the 4009 IC.
Solder a wire from pin 11 to ground on the 4009 IC.

The circuit will then run with the same output frequency as you use on the signal generator.
Maximum input frequency is approx. 500kHz. (That is all the H11D1 can take.)

Groundloop.

Thanks for the detailed instruction .
i was asking ,if you can to redo the mods for a new pcb so if anyone would like to replicate it.
Thank you

Najman

[Groundloop]

@najman100,

Yes I will do that tomorrow. It is in the middle of the night now and I have been working
on this switch all day long. I will post a updated Eagle drawing. I will also try to make
the PCB a single sided layout.

Groundloop.