I found both circuit diagrams and their explanations and they look basically the same to me, I don't know if it has to do with the waveform of the output signal but i can't find other differences.
Thanks

 

hi Imarcg,
Welcome to AAC.
Please a diagram of the circuits you are referring too.
E

 

hi Imarcg,
Welcome to AAC.
Please a diagram of the circuits you are referring too.
E

Hi, thanks, these two:

 

A Shockley diode is a four layer (P-N-P-N) device. It conducts when it is forward biased and stops conducting when it is reverse biased. The major difference from conventional diode is that a Shockley diode does not start conducting until the forward voltage exceeds break-over voltage.
A DIAC acts like two Shockley diodes connected in parallel with one being reversed. It is for AC and has the same characteristics for both directions of voltage.
Regards,
Keith

 

Shockley diodes are no longer being manufactured. You can still get DIACS

https://www.st.com/resource/en/datasheet/smdb3.pdf

 

A Shockley diode is a four layer (P-N-P-N) device. It conducts when it is forward biased and stops conducting when it is reverse biased. The major difference from conventional diode is that a Shockley diode does not start conducting until the forward voltage exceeds break-over voltage.
A DIAC acts like two Shockley diodes connected in parallel with one being reversed. It is for AC and has the same characteristics for both directions of voltage.
Regards,
Keith

The DIAC has a very different structure. It has the structure of a symmetric NPN transistor. Its operation is based on avalanche breakdown mode. I made my model based on all this. This model reflects the work of the real DIAC quite accurately.
https://www.mikrocontroller.net/topic/403520

 

Or, if ordering one is too much trouble:

 

Or, if ordering one is too much trouble:

Yes, a transistor will work just as well. You just have to make sure the max. collector current is not exceeded.
In 1954 I made a relaxation oscillator using a Mullard OC71 germanium transistor.
Keith

 

hi Imarcg,
Welcome to AAC.
Please a diagram of the circuits you are referring too.
E

But is it possible to use a DIAC for a relaxation oscillator?

 

Or, if ordering one is too much trouble:

View attachment 206783

but is it possible to use the DIAC for a relaxation oscillator?

 

The DIAC has a very different structure. It has the structure of a symmetric NPN transistor. Its operation is based on avalanche breakdown mode. I made my model based on all this. This model reflects the work of the real DIAC quite accurately.
https://www.mikrocontroller.net/topic/403520View attachment 206766View attachment 206767

but is it possible to use the DIAC for a relaxation oscillator?

 

but is it possible to use the DIAC for a relaxation oscillator?

Yes.
http://www.bristolwatch.com/ele/diac.htm

 

but is it possible to use the DIAC for a relaxation oscillator?

I'm surprised. Can't you see that my top drawing shows a relaxator.