Turbo rpm gauge

[wannabebuilderuk]

Spotted this little bit circuitry, I wonder if it could be paired up with the a laser/sensor diode from a cheap laser tachometer and used as a remote gauge?

www.ebay.co.uk/itm/295938823176

There's also inductive ones which could be wired up to a photo diode for a similar effect and work as a run time meter?

www.ebay.co.uk/itm/394924751143

[wannabebuilderuk]

There's these modules that people use for diy arduino rpm sensors which could be used as well

www.ebay.co.uk/itm/123956379816

Example youtu.be/0UqHNrqmTRU?feature=shared

[wannabebuilderuk]

Did a bit more reading on this part, it could definitely work for a budget friendly diy rpm gauge as much faster refresh than a hand held (3x a second vs 1x) and can be panel mounted, just needs to be hooked up to a suitable sensor such as the photoelectric module from a tachometer or a hall effect sensor.

www.ebay.co.uk/itm/295938823176

[wannabebuilderuk]

Found another potential device, can be paired with an ir proximity sensor.

www.ebay.co.uk/itm/294854361787

www.ebay.co.uk/itm/315081170637

[richardm]

One problem with those is that won't display above 99,999 rpm and many turbos (specially smaller units ) go well above 100,000 rpm. I once considered using one of those with a divide by 10 circuits with I could have built but finally turned to a Garret turbo tachometer ... Way more expensive ..

[wannabebuilderuk]

Feb 8, 2024 15:12:22 GMT -5 richardm said:

One problem with those is that won't display above 99,999 rpm and many turbos (specially smaller units ) go well above 100,000 rpm. I once considered using one of those with a divide by 10 circuits with I could have built but finally turned to a Garret turbo tachometer ... Way more expensive ..

True but if you're at the stage where you want a way to watch the rpm without holding a slow to refresh laser tachometer because you're going for every drop of power on a large diameter turbo spinning below 100k then these could work without the price of a garrett tachometer.

Once I get my build running I might take the hit and buy one for a fiddle to confirm if it's viable for us builders

[richardm]

As I Said it is possible to divide the incoming signal by 10 so that the tach displays rpm x 10 Long time ago I had a simple ttl logic circuit plan to do it but Im not in electronics anymore

www.google.com/url?sa=i&url=https%3A%2F%2Fwww.incbtech.com%2Findex.php%2Fcircuit-bench%2F636-divide-by-10-counter-4018-cb171&psig=AOvVaw05mSwjE91EX7oVlX0vOQZt&ust=1707530025371000&source=images&cd=vfe&opi=89978449&ved=0CBYQ3YkBahcKEwjI8Mick52EAxUAAAAAHQAAAAAQBA