- Joined
- May 13, 2010
- Messages
- 18
- Points
- 0
Hello,
I have 6 Flexmod drivers that I want to hookup to a breakout board circuit that I am designing. The circuit is very simple but I have a question concerning one design feature that I came up with.
I want to implement a SPDT switch that will select between enabling the TTL modulation input on or off for each driver. I have this design (shown below, for one driver only) that incorporates an indicator LED that turns on when the modulation input switched on:
Only problem with this setup is that the LED will drop the voltage of the TTL input voltage (5 volts) before it is fed to the driver. To correct this I included an opamp at the TTL input that will correct for the voltage drop of the LED:
Is this the best way to implement this feature or can it be improved upon? One thing that concerns me is that the opamp will not supply enough current to power the LED and provide the modulation. Am I correct in this assumption? I am fairly new to circuit design but this is what I came up with.
Any advice is appreciated.
I have 6 Flexmod drivers that I want to hookup to a breakout board circuit that I am designing. The circuit is very simple but I have a question concerning one design feature that I came up with.
I want to implement a SPDT switch that will select between enabling the TTL modulation input on or off for each driver. I have this design (shown below, for one driver only) that incorporates an indicator LED that turns on when the modulation input switched on:
Only problem with this setup is that the LED will drop the voltage of the TTL input voltage (5 volts) before it is fed to the driver. To correct this I included an opamp at the TTL input that will correct for the voltage drop of the LED:
Is this the best way to implement this feature or can it be improved upon? One thing that concerns me is that the opamp will not supply enough current to power the LED and provide the modulation. Am I correct in this assumption? I am fairly new to circuit design but this is what I came up with.
Any advice is appreciated.