Hi,
I just finished assembling the DDL Driver based on the schematic images on Rog8811's site.
I am having readings that do not agree with the instructions.
I am not getting the 1.25V reference voltage across the middle pin of the 317 to after the resistors.
I am getting the full input voltage at the output from the driver circuit, where the LD will sit.
I am confused about the two diagrams, the assembly, and the testing diagrams.
I think there might be a discrepancy between the two diagrams. on the assembly diagram it shows the middle and last pin on the pot to be commoned, where as on the circuit test diagram it shows the first and middle pins to be commoned.
And on the Veroboard layout the resistor is before the pot with the first and middle pins commoned.
Am I reading these diagrams incorrectly?
Which one is correct?
Heres a link to his page just incase,
Laser driver - It can be done
if you need me to circle the parts of the circuit that I think are different, I'll do that and post them here later on tonight.
thanks for any insights you can offer..
I just finished assembling the DDL Driver based on the schematic images on Rog8811's site.
I am having readings that do not agree with the instructions.
I am not getting the 1.25V reference voltage across the middle pin of the 317 to after the resistors.
I am getting the full input voltage at the output from the driver circuit, where the LD will sit.
I am confused about the two diagrams, the assembly, and the testing diagrams.
I think there might be a discrepancy between the two diagrams. on the assembly diagram it shows the middle and last pin on the pot to be commoned, where as on the circuit test diagram it shows the first and middle pins to be commoned.
And on the Veroboard layout the resistor is before the pot with the first and middle pins commoned.
Am I reading these diagrams incorrectly?
Which one is correct?
Heres a link to his page just incase,
Laser driver - It can be done
if you need me to circle the parts of the circuit that I think are different, I'll do that and post them here later on tonight.
thanks for any insights you can offer..