1
\$\begingroup\$

is it possible optocoupler EL817 wiht input 3.3VDC and output 24VDC like below circuit. and if it possible what is the suitable value for the resistor

enter image description here

\$\endgroup\$
8
  • \$\begingroup\$ 1. EL817 output is not strong enough to directly drive a buzzer. The usual trick is to first drive a BJT which is strong enough to in turn to drive a relay switch (or a buzzer). You might like to skim the following post to get a rough idea on the EL817C/NPN BJT biasing design. 2. If you are going to use a BJT for EL817C, you might like to show your circuit so everybody can help. Cheers. Ref: electronics.stackexchange.com/questions/505318/…. \$\endgroup\$
    – tlfong01
    Aug 12, 2021 at 1:34
  • 1
    \$\begingroup\$ Why would a buzzer need opto-isolation and what current is this? \$\endgroup\$ Aug 12, 2021 at 1:53
  • 2
    \$\begingroup\$ please stop shouting. \$\endgroup\$
    – Hearth
    Aug 12, 2021 at 2:21
  • 1
    \$\begingroup\$ @tlfong01 okey i will upload full schematic after it finish. \$\endgroup\$ Aug 12, 2021 at 5:53
  • 1
    \$\begingroup\$ @TonyStewartEE75 in this case i want to switch on the buzzer by give 24VDC \$\endgroup\$ Aug 12, 2021 at 5:54

0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.