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Novag adapter 8.5 v dc question

 
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kosterix
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Joined: 07 Aug 2017
Posts: 40

PostPosted: Mon Aug 28, 2017 4:25 pm    Post subject: Novag adapter 8.5 v dc question Reply with quote

What would happen when I use a regular 9v adapter on a novag super sensor iv
Would it burn the machine?
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kosterix
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PostPosted: Mon Aug 28, 2017 6:05 pm    Post subject: Reply with quote

I ask this because I can nowhere seem to find 8.5v adapters for EU current.
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JeffB
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Full Name: Jeff Bosch
Location: Seattle, WA USA

PostPosted: Mon Aug 28, 2017 6:13 pm    Post subject: Reply with quote

Hi -

The Novag Super Sensor uses an 8.5 volt AC adapter, not DC. (That could explain not being able to find one. I have some from European computers I've purchased, but I'm here in the USA and I don't know if it's worth shipping cost.)

I recommend doing a new search for 8.5vac and see what you find. There should be plenty. I've also used adapters from Verifone and a few other manufacturers because they use the same connector.

In theory, the 9VDC should work fine. The machine has a rectifier circuit to convert AC to DC, which should then be fed into a regulator at whatever voltage the system requires, probably 5VDC considering the era. That said, I'd still try to find the correct adapter. Let me know if I can help with searching.
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Larry
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Joined: 01 Aug 2007
Posts: 1709
Location: Gosford, NSW Australia

PostPosted: Mon Aug 28, 2017 8:15 pm    Post subject: Reply with quote

kosterix wrote:
I ask this because I can nowhere seem to find 8.5v adapters for EU current.

Just looked at https://www.schach-computer.info/wiki/index.php?title=Novag_Super_Sensor_IV
The comp can't convert dc to AC so it won't work. The AC output adapters
are a bit harder to come by, but until you find one you have to
use batteries.
L
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JeffB
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Full Name: Jeff Bosch
Location: Seattle, WA USA

PostPosted: Mon Aug 28, 2017 8:45 pm    Post subject: Reply with quote

The computer won't have to convert DC to AC. Internally, it converts the AC input to DC. If you feed DC into a power supply that expects AC*, it will pass through the full-wave rectifier as the DC voltage minus the loss across the diodes, then into the regulator. So, unless the computer requires AC internally (which I doubt it does), then feeding DC should work. However, there is a small chance that the input to the regulator exceeds its maximum input voltage**, which could cause it to malfunction or overheat, therefore ...

... it's still best practice to use an adaptor with the correct specs, though it can be from a different manufacturer.


* I'm talking about a small AC input, such as 8.5 volts, not a 120 or 220 volt line input. In that case, the voltage would be way too low to do anything useful.

** If you're brave and handy with a screwdriver, you could open the unit, find the voltage regulator, then look up its specs online. If it's the standard 7805, you're probably safe. If it's a 78L05, maybe not.
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