BillGriffiths100 wrote:Are you using 74HC high speed Cmos logic (or equivalent) or the older type?
If you are using the older type it's an order of magnitude slower that may be your problem.
It's HCF4066BE
BillGriffiths100 wrote:Are you using 74HC high speed Cmos logic (or equivalent) or the older type?
If you are using the older type it's an order of magnitude slower that may be your problem.
It's HCF4066BE
RCModelReviews wrote:Note that the Ron (resistance in the on-state) of the switch is nominally some 96 ohm so if you're driving a 75ohm video device you'll get some signal attenuation through the switch.
This hasn't been an issue driving any of the LCD displays or FatShark goggles to date but you could use a level/impedance shifter on each channel before the switch or simply use a higher-impedance non-inverting amp/buffer on the combined output.
If you've tied all four switch outputs together, make sure you've got only the active switch turned on -- if you've left any of the control signals floating they will likely turn the unused switches on and that could drag down your output signal significantly.
If you've tied all four switch outputs together, make sure you've got only the active switch turned on -- if you've left any of the control signals floating they will likely turn the unused switches on and that could drag down your output signal significantly.
100pF is probably a bit small -- I generally use 0.1uF (100nF) ceramic decoupling caps for best results
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