[TenTec] Need advice about OVP for 262G

[Tim Long]

Hello Curt,
Over-Voltage Protection is normally done with a "crowbar" circuit.  
There are several circuits but the gist is you have a comparator with a 
very sharp knee that triggers an SCR.  The SCR conducts the shorting 
current and blows the fuse.  I've seen circuits using a UJT and another 
using a 723 voltage regulator.  Mine uses a 723 voltage regulator.  If I 
can find the schematic, I'll scan it and send it to you.
73, Tim, W2UI

Hulett, Russell wrote:
> Hello Mike,
>
> As I read the datasheet for the 1.5KE15A, the breakdown voltage is nominally 15 VDC.  So when the pass transistor shorts, won't the transient diode limit the voltage to the load to nominal 15 VDC, bypassing enough current to ground to trip the overload on the power supply?
>
> I intend to incorporate a fast-blow fuse, not sure why the question prompted the sarcasm.
>
> 73, Curt KB5JO
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