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Show"N"Tell ( What you have made with your CNC machine.) / Re: My first attempts at laser engraving.
« on: June 28, 2009, 07:06:59 AM »
Hi Chris,
The secondary cable on your laser controller board is for the TTL modulation input, if you choose to use it. The white wire is connected to ground and the blue wire is for the TTL signal (<0.5 Volt=closed and >2 Volt=open) this already incorporates a 'pull up' resistor so pulling the blue wire to ground turns the laser off and open circuit turns the laser on. The spec for the modulation input is TTL levels at a frequency no greater than 15 kHz.
Tweakie.
The secondary cable on your laser controller board is for the TTL modulation input, if you choose to use it. The white wire is connected to ground and the blue wire is for the TTL signal (<0.5 Volt=closed and >2 Volt=open) this already incorporates a 'pull up' resistor so pulling the blue wire to ground turns the laser off and open circuit turns the laser on. The spec for the modulation input is TTL levels at a frequency no greater than 15 kHz.
Tweakie.