This seems a lot more complex than the string of DPDT toggle switches, which would allow revising the sequence whenever you wanted to, and required zero standby power. And were totally immune to most static discharge damage, except for actual lightning strikes.

 

eetech00,

I have another small doubt about the switch connections here.
Why are these shown with three terminals and the normally closed contact of the switch connecting to the next one. Is that the way it should be connected. So I need momentary no locking push button switches with normally closed and normally open contacts like the one I have shown in post#31

https://roboticsdna.in/product/7mmx7mm-tactile-push-button-switch-no-locking-5-pcs-white/

 

WRONG!! that scheme would use latching switches, toggle types preferred because they indicate their position with no power consumption.So it is not exactly like the "radio button" scheme, but it will provide the same "only one selected" output. WHAT IS the fascination with the radio button switching scheme???

 

WHAT IS the fascination with the radio button switching scheme???

My humble opinion is that the radio push button scheme is easy to use. Just push a desired button and the desired output frequency is turned ON.

 

eetech00,

I have another small doubt about the switch connections here.
View attachment 327906Why are these shown with three terminals and the normally closed contact of the switch connecting to the next one. Is that the way it should be connected. So I need momentary no locking push button switches with normally closed and normally open contacts like the one I have shown in post#31

https://roboticsdna.in/product/7mmx7mm-tactile-push-button-switch-no-locking-5-pcs-white/
View attachment 327907

The switches are momentary with one form C contact or one NO and NC contact wired as a Form C.

They are wired that way to prevent more than one switch output from being active at the same time.

 

The switches are momentary with one form C contact or one NO and NC contact wired as a Form C.

No, they need to be latching switches, since they are directly selecting the output, not controlling some circuitry with memory.

 

No, they need to be latching switches, since they are directly selecting the output, not controlling some circuitry with memory.

No…the FFs provide address storage.

 

No…the FFs provide address storage.

No... the purpose of the latching switches is to remember the setting so you don't need flip-flops.

 

They are wired that way to prevent more than one switch output from being active at the same time.

When the switches are no locking momentary push button switches that release after our finger is removed then more than one switches cannot be active at the same time unless there is a mechanical jamming in the switch.

 

then more than one switches cannot be active at the same time

That's not really a problem for the posted radio-pb circuits.

 

When the switches are no locking momentary push button switches that release after our finger is removed then more than one switches cannot be active at the same time unless there is a mechanical jamming in the switch.

yes.. but more that one output can be active if more than one is pressed which is not what I want.

 

No... the purpose of the latching switches is to remember the setting so you don't need flip-flops.

I don’t want to use latching switches.

 

I don’t want to use latching switches.

Ok so I will wire the switch connections as shown in the circuit using the switch in post #122. With the normally closed contacts connected in series. That should prevent any problems arising when more than one switch is pressed at the same time for some crazy reason.

 

That should prevent any problems arising when more than one switch is pressed at the same time for some crazy reason.

Yes...but it happens, accidentally, or intentionally.