Square Wave Frequency Doubler?

davepusey · Jun 10, 2004

Is there such a circuit as a "Square Wave Frequency Doubler"? I have a square wave of fixed frequency and i need to double it. I.e. the current frequency is 0.5Hz and i need to convert it to 1Hz. How can this be done?

If yes, where can i find it?
If no, does anyone know of a way to do this?

Thanks in advance.

Russlk · Jun 10, 2004

If you differentiate the square wave (put it thru a high pass filter), then full wave rectify the resultant AC, you will have doubled the frequency.

panic mode · Jun 10, 2004

And to convert it back to square wave simply use circuit with
histeresis like schmidt trigger...

davepusey · Jun 11, 2004

Russlk said:
If you differentiate the square wave (put it thru a high pass filter), then full wave rectify the resultant AC, you will have doubled the frequency.

no technobable please.

Nigel Goodwin · Jun 11, 2004

davepusey said:
Russlk said:

If you differentiate the square wave (put it thru a high pass filter), then full wave rectify the resultant AC, you will have doubled the frequency.

Click to expand...

no technobable please.

It wasn't 'technobabble', it's actually quite simple. However, I think you probably need to mention what you are trying to do - the above method, though simple and effective, may not work for your purposes.

Styx · Jun 11, 2004

Im sure you can do with a rising-edge triggered d-type a falling-edge d-type and an XOR gate + maybe some extra logic.

hang on ill see if it csn be done that way

Styx · Jun 11, 2004

well not far off

found this

**broken link removed**

TillEulenspiegel · Jun 11, 2004

Ya,Ya Nigel, You just wanted to say big words!

Roff · Jun 11, 2004

davepusey said:
Is there such a circuit as a "Square Wave Frequency Doubler"? I have a square wave of fixed frequency and i need to double it. I.e. the current frequency is 0.5Hz and i need to convert it to 1Hz. How can this be done?

If yes, where can i find it?
If no, does anyone know of a way to do this?

Thanks in advance.

The ideas proposed will only work if your "square wave" is truly square, i.e., 50% duty cycle. If it is not, you will need a phaselocked loop. Is your square wave actually square?

davepusey · Jun 12, 2004

Ron H said:
The ideas proposed will only work if your "square wave" is truly square, i.e., 50% duty cycle. If it is not, you will need a phaselocked loop. Is your square wave actually square?

Yes. 50% duty cycle.

davepusey · Jun 12, 2004

Styx said:
well not far off

found this

**broken link removed**

Yeah that circuit looks great. but what is the HC86 box thing and what are the pin connections shown?

Code:

                        +-------+
                        | hc86  |
            +-----------+       |
  clkin ----+           |       +--- clkout = 2*clkin
            +-N-R-+-N---+       |
                  |     |       |
                  C     +-------+
                  |
                 gnd

where N is a NOT gate (hc04?)
      R is a 10k resistor
      C is a 47pf capacitor.

davepusey · Jun 12, 2004

davepusey said:
Styx said:

well not far off

found this

**broken link removed**

Click to expand...

Yeah that circuit looks great. but what is the HC86 box thing and what are the pin connections shown?

Code:

+-------+ | hc86 | +-----------+ | clkin ----+ | +--- clkout = 2*clkin +-N-R-+-N---+ | | | | C +-------+ | gnd where N is a NOT gate (hc04?) R is a 10k resistor C is a 47pf capacitor.

Never mind... it's an XOR... **broken link removed**

Sorry

davepusey · Jun 12, 2004

Please forget this question and goto https://www.electro-tech-online.com/threads/eeprom-problem.9739/

Sebi · Jun 12, 2004

This circuit works fine.

davepusey · Jun 12, 2004

Thats brilliant thanks.

davepusey · Jun 12, 2004

What value is the two capacitors?

pebe · Jun 14, 2004

Davepusey, look in your personal mailbox re locked topic.

davepusey · Jun 15, 2004

pebe said:
Davepusey, look in your personal mailbox re locked topic.

You have no messages in this folder

bunghole · Sep 26, 2006

hey, i'm also looking for a frequency doubler, i had a look at that circuit and i got a few questions. the CD4528, is that just draw in two pieces when it's actually one and also if i put say, 2Hz on the input, on the output would i just get double the frequency and what the input and outputs are, thanks

Hero999 · Sep 26, 2006

davepusey said:
no technobable please.

If you don't understand what someone says, try Googling for some of the keywords in their post you don't understand.

Square Wave Frequency Doubler?

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