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Can this schematics run at 36khz rather than 40 ?

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CommanderKeen

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Help needed fast!

Can this schematic run at 36khz.
**broken link removed**

Cause my Detector runs at 36khz, and not 40khz like on the link i gave you.
 

Re: Help needed fast!

You should be able to tune this circuit down to ≈32kHz as it is, without changing components (R5 and R4) ..

Regards,
IanP
 

Re: Help needed fast!

So this curcuit is actually running at 32khz now. How did you calculate it to that.?
 

Re: Help needed fast!

Hi guys. I have another question that I wanna ask you all.. Look at this following circuit http://www.aaroncake.net/circuits/counter.htm
And now on the datasheet for 74LS47 - **broken link removed**

I can't really figure out where my pin 3-5 and 4 shall be connected.
 

Re: Help needed fast!

In single digit applications pins 3, 4 and 5 will not be used, so connect inputs (LT and RBI) to +5V and leave RBO not connected ..
In multidigit applications if you want to suppress leading "zeros" you will be using RBI and BI/RBO pins:
If the input data is decimal zero, a LOW signal applied to the RBI blanks the display and causes a multidigit display. For example, by grounding the RBI of the highest order decoder and connecting its BI/RBO to RBI of the next lowest order decoder, etc., leading zeros will be suppressed.
Click to expand...

"So this curcuit is actually running at 32khz now. How did you calculate it to that.?"

555 has a formula for T, or f if you like, and using that formula you can estimate the periods (T=T1+T2) .. see any 555 data sheet and you will find it out ..

Regards,
IanP
 
Re: Help needed fast!

Okay, thanks. Then i need to change the resistors so it sends a signal of 36khz.
 

Re: Help needed fast!

Can someone explain to me, why he using 2x 555.
and why can't spot C3,C4 on the detector shematic, when i can see them on the component reference list.

Added after 42 minutes:

I got the sender and reciver to work a bit. The problem is When I power up my reciever circuit, and measure the output of the LM339 it is slowly raising up. Why is that.? It takes rougly 10-30sec for it to gain the 5V.
 

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