Author Topic: Tektronix tunnel diodes, how to test ?  (Read 452 times)

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Online alpher

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Tektronix tunnel diodes, how to test ?
« on: December 07, 2019, 01:12:11 am »
Hi, just bought a few of the rare 152-0177-02 tek tunnel diodes.
They're obvious pulls, is there a simple way to check them if they're any good?
I don't have a curve tracer, tried a simple check with 100 \$\Omega\$ resistor and 100Hz ramp signal from function gen
From here : https://hackaday.com/2019/05/08/fun-with-negative-resistance-jellybean-transistors/
But all I get is a straight line like resistors :-//
Afraid to damage the quasi unobtanium diodes, can anyone suggest a better circuit to test them?


 

Offline madao

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Re: Tektronix tunnel diodes, how to test ?
« Reply #1 on: December 07, 2019, 06:43:20 am »
Ramp like resistor and current over 10mA is reached.

Sadly, it is dead.
Tunneldiode doesn't like good long high current about peak current . This is a notice.

Regards
matt
 

Offline jonpaul

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Re: Tektronix tunnel diodes, how to test ?
« Reply #2 on: December 07, 2019, 04:48:27 pm »
Hello the TDs are available on epay occasionally new packages or Chinese copies or Russian equivalent

NEVER USE a func gen 50 ohms without a 1 k series resistance

Use a positive only ramp no negative!

Read up on TD precautions and testing first.

Even a microsecond of overload kills them, eg static electricity.

Handle with static precautions

Jon

Jon Paul
 
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Offline GerryR

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Re: Tektronix tunnel diodes, how to test ?
« Reply #3 on: December 07, 2019, 05:46:44 pm »
Here's a quick tutorial by W2AEW:

Still learning; good judgment come from experience, which comes from bad judgment!!
 
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