Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

[SOLVED] Regarding MOC7811 circuit

Status
Not open for further replies.

Anantha Krishna

Member level 1
Joined
Feb 10, 2011
Messages
41
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Activity points
1,642
Hi All,

I am building a circuit using MOC7811 which gives me a rising edge and a falling edge using standard procedure(i.e. MOC7811 is opto detector). I am using the attached circuit.

But the problem is that I am not able to get the proper voltage at the output when I connect it to microcontroller[i.e. I am getting 1.8 V instead of 5V]. When the output is not connected to Microcontroller and voltage is measured at the output using multimeter, it works fine.

Please suggest any changes to be done in this basic circuit to get a proper voltage(i.e atleast 4V).

Thank you.

http://images.elektroda.net/31_1307962990.jpg
 

dv_sa559

Advanced Member level 4
Joined
Dec 3, 2009
Messages
106
Helped
31
Reputation
62
Reaction score
30
Trophy points
1,308
Location
Iran
Activity points
1,819
Hi
sorry for my english.
I don't understand that you said when you connect micro to circuit , voltage will be fall in 1.8v
Please clear me , when opto led was off then transistor is off , hence we don't have any current in resistor and vout will be 5 v
perhaps your micro was damage and sink your current then voltage fall in 1.8 v or your opto is on
may you decries resistor 10k to 2.2k and test it , if it happen for current leak by mico
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top