If you are going for the click sound, also consider using a 10 position stepper switch. One stepper can control an entire digit and
could be used to advance the next stepper. These, and other like them were used in rotary phone systems. Some of those have a
release relay, so you can reset a digit to 0 or off from any state. Since these require more current, I would expect for them to be
louder than modern 5V relays, but they draw nothing when they are not moving. I would expect for the old steppers to sound quite
monotonous over time, but maybe less so if put in a tight wooden enclosure or something.
Mechanical Nixie tube Clock:
http://www.youtube.com/watch?v=YajwGdbXV1w
(no relation to me)
On 08/07/2013 05:50 AM, ahochan wrote:
Hi,
I'm thinking of creating a Nixie clock controlled by mechanical 5V relays.
I won't do anything fancy, just static drive with the Nixie anode connected
to 180VDC through a resistor and one relay for each cathode. The relay coils
will be connected to uC pins via either individual transistors or perhaps
a darlington array. Like so:
180V
|
R (anode resistor)
|
Nixie
| ... |
1 relay for each cathode (connected to GND)
Schematic here:
https://www.dropbox.com/s/r67bnrz09b4xivv/relay-nixie-test-board.png
I'll probably use IN-4 tubes, but that may change.
I have two questions:
* Does my schematic look sane?
* Can anyone recommend a relay to use?
I'm looking for a relay that can be switched from 5VDC. There are many
available in small form factors, but most seem to be rated for 250VAC/30VDC
or similar. (I guess a relay rated for a lower DC voltage might be ok too,
since it will only pull 3-4mA)
I want a mechanical relay... since the main point of this exercise is to get
the clicking sound when the relays switch.
Thanks in advance.
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