MT8870 | CM8870 | DTMF tone decoding with MT8870 | DTMF decoder

DTMF decoding to binary code using MT8870, and it is done without any microcontroller. Here, I've used two mobile, one is connected to the circuit, another is in our hand to control the circuit.
Automatic call receive:
• Android phone Auto cal...
__________________________________________________________________
Required Components:
Two mobile
MT8870
LEDs
3.57 MHz crystal oscillator
100 K Resistor
330 K Resistor
20 pF ceramic
10 nF ceramic
__________________________________________________________________
Chapter:
0:00 - Circuit
1:53 - Practical
4:41 - Output
---------------------------------------------------------------------------------
Facebook:
/ digital.debajyoti
Instagram:
user name: digital.debajyoti
Link:
/ digital.debajyoti
------------------------------------------------------------------------------------------------
You want to support me to make more videos?
Support me through Patreon-
/ debajyotinath
Support me through PayPal-
www.paypal.com/paypalme/SanuD...

[@akepatinagaraju8564]

Excellent job brother

[@mamatanath8147]

Nice video kaku 😄

[@shashankrevaskar1446]

4:57 whithout pressing any key your led 1 is glowing why

[@Devil-dn2ew]

Sir, can wer use left or right pin as audio input to decoder?? What difference does it make sir??

[@watermelon22422]

sir may I know what did you meant by 5 to 220 ohm resistor

[@bishwadeepbaruah3293]

Great.....👌👌👌

[@EEWave]

Thank you 😊

[@crazyengineer2432]

can i use 22pf not 20 pf ??

[@monky_loco]

hi! nice project! so, why the receiver phone pick up automaticaly? thanks!!!!!!!!

[@EEWave]

Hi Martin, I've already uploaded a video on automatic call receive topic. The video link is given in the description. Thanks for watching..

[@Devil-dn2ew]

Sir, could you please explain what is happening internally (inside dtmf decoder)??

[@EEWave]

Hi Devil, I'll try to make a video on this IC

[@mohdashifkhan2858]

Any alternative for 20 pf capacitor

[@jumbo999614]

I use 22pf and it also works. But I feel there is delay in LED binary response time.

[@vishalpathak050]

sir, what would be the voltage acros a led when only one led is on???????

[@EEWave]

3V for Green and Blue LED