Hi. This is my first visit to the site (I'm impressed), first post on the forums and I hope someone might be able to offer some guidance. Let me make it clear that I am very new to electronics, working on the basis of a specific need, and struggling to find a solution.
I'm sure that this is all pretty basic stuff, but a couple of days ago I didn't even know about RC networks, so please be patient!
I want to build a beeper circuit with variable interval and audio frequency output.
I found what seemed a likely looking basis, using a 556 timer:
And have built this on a breadboard
Powering the circuit up, I am getting no audible tone and the 100K variable resistor does nothing to change that. But I can hear a regular 'click', the interval of which is variable via the 500K variable resistor.
And I'm a bit stumped.
If my understanding is correct, on the pins 1-7 side, a capacitor of 2uF, R1 of 1K and R2 of 360K (notional values) would give me a 1 second on/one second off interval(?). On the 8-14 side 0.01uF/22K/100K should give a tone with a frequency of about 650Hz(?).
Does this seem reasonable?
Ultimately, I want the audio output to be line level via 3.5mm jack, but first things first...
Am I close? Or way wide of the mark in some way(s)?
Any advice would be hugely appreciated.
Thank you.
I'm sure that this is all pretty basic stuff, but a couple of days ago I didn't even know about RC networks, so please be patient!
I want to build a beeper circuit with variable interval and audio frequency output.
I found what seemed a likely looking basis, using a 556 timer:
And have built this on a breadboard
Powering the circuit up, I am getting no audible tone and the 100K variable resistor does nothing to change that. But I can hear a regular 'click', the interval of which is variable via the 500K variable resistor.
And I'm a bit stumped.
If my understanding is correct, on the pins 1-7 side, a capacitor of 2uF, R1 of 1K and R2 of 360K (notional values) would give me a 1 second on/one second off interval(?). On the 8-14 side 0.01uF/22K/100K should give a tone with a frequency of about 650Hz(?).
Does this seem reasonable?
Ultimately, I want the audio output to be line level via 3.5mm jack, but first things first...
Am I close? Or way wide of the mark in some way(s)?
Any advice would be hugely appreciated.
Thank you.
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