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2 Corrected delay unit to microseconds (not milliseconds)
source | link

The maximum speed you are going to get out of a 5V rated 28BYJ-48 is about 15RPM. I don't know if the 12V rated models run any faster.

delay RPM
msµs
2000  7
1500  9
1000 13
 900 15

The maximum speed you are going to get out of a 5V rated 28BYJ-48 is about 15RPM. I don't know if the 12V rated models run any faster.

delay RPM
ms
2000  7
1500  9
1000 13
 900 15

The maximum speed you are going to get out of a 5V rated 28BYJ-48 is about 15RPM. I don't know if the 12V rated models run any faster.

delay RPM
µs
2000  7
1500  9
1000 13
 900 15
1
source | link

The maximum speed you are going to get out of a 5V rated 28BYJ-48 is about 15RPM. I don't know if the 12V rated models run any faster.

delay RPM
ms
2000  7
1500  9
1000 13
 900 15