vielle568
Member
Can anyone tell me where I'm going wrong?
I'm trying to use a Max4619 analog switch to pulse two audio signals for a musical instrument that I'm building. At the moment I can't quite figure out how to trigger the Max4619. It requires an input signal that changes from ground to Vcc to toggle the switch. I used a 556 configured as a bistable to obtain the two trigger signals and it worked fine on the breadboard but now its all soldered in place on the PCB something has changed. I've put some LEDs across the switches to monitor their state. They work correctly, but only if I touch the case of the 556 with my finger! There seems to be some kind of electrostatic charge that's interferring with the circuit, but how do I get around this problem?
Any bright ideas? Thanks!
I'm trying to use a Max4619 analog switch to pulse two audio signals for a musical instrument that I'm building. At the moment I can't quite figure out how to trigger the Max4619. It requires an input signal that changes from ground to Vcc to toggle the switch. I used a 556 configured as a bistable to obtain the two trigger signals and it worked fine on the breadboard but now its all soldered in place on the PCB something has changed. I've put some LEDs across the switches to monitor their state. They work correctly, but only if I touch the case of the 556 with my finger! There seems to be some kind of electrostatic charge that's interferring with the circuit, but how do I get around this problem?
Any bright ideas? Thanks!