Hi everybody,
Finally i found a forum that talks only about electronics .. !!![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Anyway .. first i am kind of new to the electronics world .. i have a good background, but not expert![Roll Eyes :rolleyes: :rolleyes:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
alright, i'm thinking of a project to do with one of my friends in the university in our free time .. i'm thinking to do a "Voice Encryptor" .. but the main idea is to make it totally using hardware (with no PC required) ..
so we thought of a basic idea to use it as the base of our project .. the concept is too simple for the first step in our project then we will try to make it more advance if this works ..
anyway, the idea is to take the voice signal (which is analog) and insert it to a ADC (ADC0804) which will gives us digital output of 8-bit using the continues conversion circuit shown in this image ..
**broken link removed**
then do some process to the digital output (this process will be considered as the encryption)
then enter the result 8-bits to an DAC to re-convert it to analog (i'm using DAC0800LCN)
**broken link removed**
so that if we entered a normal sin wave from a function generator and graph the output on a Oscilloscope the output will not be a proper sin wave .. so we can consider that as a kind of encryption then the result analog signal we will take it and re do the whole process to it but with changing the digital process that we apply it to it so that the new process will decrypt the signal and the output analog signal will be the same sin wave we entered in the first time ..
this is the main idea i'm working for .. but right now i was trying to understand how to properly conect the ADC to DAC together ..
so i'm trying to connect the output from the ADC directly to the input of the DAC with no any process applied to it to just see how it works .. but i'm facing some problems knowing what should i connect some pins to !!
like the (Vref/2) in the ADC or the and the (Vref+ & Vref-) and the (VLC) in DAC ??
i tried to use an 5V PK-PK sinusoidal as an input for the ADC and i connected the (Vref/2) in the ADC to a +2.5V and in the DAC i connected (Vref+) to a +5V and (Vref-) to a -5V and the (VLC) to a GND and i haven't connected the (COPM) to anything .. the result was sinusoidal too, but the problem was that it was 10mV PK-PK only !!!
so any idea how to help me in my project .. and sorry for the very long post![Stick Out Tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Regards,
Ata
Finally i found a forum that talks only about electronics .. !!
Anyway .. first i am kind of new to the electronics world .. i have a good background, but not expert
alright, i'm thinking of a project to do with one of my friends in the university in our free time .. i'm thinking to do a "Voice Encryptor" .. but the main idea is to make it totally using hardware (with no PC required) ..
so we thought of a basic idea to use it as the base of our project .. the concept is too simple for the first step in our project then we will try to make it more advance if this works ..
anyway, the idea is to take the voice signal (which is analog) and insert it to a ADC (ADC0804) which will gives us digital output of 8-bit using the continues conversion circuit shown in this image ..
**broken link removed**
then do some process to the digital output (this process will be considered as the encryption)
then enter the result 8-bits to an DAC to re-convert it to analog (i'm using DAC0800LCN)
**broken link removed**
so that if we entered a normal sin wave from a function generator and graph the output on a Oscilloscope the output will not be a proper sin wave .. so we can consider that as a kind of encryption then the result analog signal we will take it and re do the whole process to it but with changing the digital process that we apply it to it so that the new process will decrypt the signal and the output analog signal will be the same sin wave we entered in the first time ..
this is the main idea i'm working for .. but right now i was trying to understand how to properly conect the ADC to DAC together ..
so i'm trying to connect the output from the ADC directly to the input of the DAC with no any process applied to it to just see how it works .. but i'm facing some problems knowing what should i connect some pins to !!
like the (Vref/2) in the ADC or the and the (Vref+ & Vref-) and the (VLC) in DAC ??
i tried to use an 5V PK-PK sinusoidal as an input for the ADC and i connected the (Vref/2) in the ADC to a +2.5V and in the DAC i connected (Vref+) to a +5V and (Vref-) to a -5V and the (VLC) to a GND and i haven't connected the (COPM) to anything .. the result was sinusoidal too, but the problem was that it was 10mV PK-PK only !!!
so any idea how to help me in my project .. and sorry for the very long post
Regards,
Ata
Last edited: