Voltage Suppression from 35V - 20V

[Daniel Floyd]

Ok i am a hobbyist and i currently building a circuit in which when i place this on an oscilloscope i am gaining a voltage spike of 38V i need to minimise this spike down to a maximum of 20V in order to protect my external circuitry. When my circuit is working under 20V i need this protective device to have no action thus the circuit as it would. The current in this circuit is a big problem so using resistors in series resulting in less current is not an option.

I have heard that there are protective resistors that can be used or zenner diode circuits. can anybody help me with this?


Regards Daniel Floyd.

 

[berkeman]

Ok i am a hobbyist and i currently building a circuit in which when i place this on an oscilloscope i am gaining a voltage spike of 38V i need to minimise this spike down to a maximum of 20V in order to protect my external circuitry. When my circuit is working under 20V i need this protective device to have no action thus the circuit as it would. The current in this circuit is a big problem so using resistors in series resulting in less current is not an option.

I have heard that there are protective resistors that can be used or zenner diode circuits. can anybody help me with this?


Regards Daniel Floyd.

Can you post a schematic of your circuit?

 

[the_emi_guy]

What is the source of your voltage spike?

 

[mearvk]

Could you use a 20v voltage regulator?

 

[Carl Pugh]

What you probably need is a TVS (Transient Voltage Suppressor).
One way to get a data sheet on a TVS is to go to either Mouser or Digi-Key and search for TVS. When you are shown data for TVS, select a like one and then ask for a data sheet.
It may take some searching, but you should be able to locate a TVS that will keep the transient voltage below 20 volt.

Good Luck
Carl

 

[Averagesupernova]

Look up P6KE24V. It is a zener type device that can REALLY take a beating. Of course it is available in other voltages, the number I gave is a 24 volt device.

 

[Daniel Floyd]

Thank you i will begin my search around a TVS from Mouser I will then post my findings.