Astable multivibrator 555 problem in circuit

ericgibbs

Joined Jan 29, 2010
8,719
48khz is the frequency. Should that be altered?
Hi,
You will not hear 48kHz, design for for around 3kHz, this a frequency we can hear OK.
Try R4 and R5 at 10K, that should be around 5kHz, lets know how it goes.

E
EDIT:
If you want close to 3kHz, use 15k's
 

Thread Starter

faria_syd

Joined Aug 29, 2015
11
Is a coupling capacitor of 10uf before speaker okay or i need to use some other value
 

ericgibbs

Joined Jan 29, 2010
8,719
Is a coupling capacitor of 10uf before speaker okay or i need to use some other value
hi f,
For a simple 'sounder' a 10uF thru 100uF should be OK.
Let me know when it works.
E
 

Thread Starter

faria_syd

Joined Aug 29, 2015
11
I used R1as 56k n R2 as 10k with C 0.01u
It works extremely well now. Thanks Eric
 
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