Feral Feline
Well-known member
I really like CD4049 circuits, a hex of inverting buffers, and recently I've been looking at the datasheet again.
The CD4050 is included on the same datasheet, in most cases, and the CD4050 shares the same pinout as the '49, has the same number of buffers (non-inverting), the same power requirements ... they are ssssooo similar. So I'm trying to learn more about the similarities and differences.
Graphs on the Datasheet:
- The Minimum & Maximum voltage transfers differ slightly;
- Drain-to-source voltage differ slightly;
- Typical Output High (Source) current differs slightly;
- Input voltage as a function of temperature differs only slightly.
The differences might matter if your circuit is logic-based and needs to be high or low (speaking of which...)
Function Table for CD4050B
However, for our purposes we're talking simple distortion circuits, EQ, etc — for our needs, really, I think the differences between the '49UB and '50B are quite minor.
Kinda boils down to this (4049 top, 4050 bottom):
Further to building pedals — I'm not particularly fond of circuits that invert the phase of a signal — makes clean-blends and other pedals in the chain behave erratically and given the amount of times bass-players employ a clean-blend ...
While many '49UB-based circuits such as the Red Llama, Hot Tubes, Blackstone OD, etc don't invert because the signal gets inverted enough times within the circuit for the output to be in phase with the input, what about the circuits that invert signal phase?
I've looked at DIYSB, FSB and a few other forums besides that and there is squat info — there's barely any mention at all of the CD4050, which doesn't invert phase...
SO WHY THE HELL ISN'T THE CD4050 USED MORE?
The CD4050 is included on the same datasheet, in most cases, and the CD4050 shares the same pinout as the '49, has the same number of buffers (non-inverting), the same power requirements ... they are ssssooo similar. So I'm trying to learn more about the similarities and differences.
Graphs on the Datasheet:
- The Minimum & Maximum voltage transfers differ slightly;
- Drain-to-source voltage differ slightly;
- Typical Output High (Source) current differs slightly;
- Input voltage as a function of temperature differs only slightly.
The differences might matter if your circuit is logic-based and needs to be high or low (speaking of which...)
Function Table for CD4049UB
INPUT | OUTPUT |
High | Low |
Low | High |
Function Table for CD4050B
INPUT | OUTPUT |
High | High |
Low | Low |
However, for our purposes we're talking simple distortion circuits, EQ, etc — for our needs, really, I think the differences between the '49UB and '50B are quite minor.
Kinda boils down to this (4049 top, 4050 bottom):
Further to building pedals — I'm not particularly fond of circuits that invert the phase of a signal — makes clean-blends and other pedals in the chain behave erratically and given the amount of times bass-players employ a clean-blend ...
While many '49UB-based circuits such as the Red Llama, Hot Tubes, Blackstone OD, etc don't invert because the signal gets inverted enough times within the circuit for the output to be in phase with the input, what about the circuits that invert signal phase?
I've looked at DIYSB, FSB and a few other forums besides that and there is squat info — there's barely any mention at all of the CD4050, which doesn't invert phase...
SO WHY THE HELL ISN'T THE CD4050 USED MORE?