Tunnel Diode Oscillator

[Andre Kesteloot]

Joe,
Nothing like building something, and then seeing it working, to restore our pride and confidence :-)
73
André N4ICK

Sent from my iPhone



> On Mar 21, 2014, at 22:13, Joseph Bento <joseph at kirtland.com> wrote:
> 
> Hi Guys,
> 
> This was already shared with some of you.  My first tunnel diode oscillator!
> 
> It works... Oscillation is at about 20MHz.  Not exactly a good circuit for a solderless breadboard, but it at least exhibits the behavior I was seeking.  I may need to investigate a proper frequency counter at Hamvention.  Right now, using 1/x on the scope     gives a rough estimate.  My coil and cap are not the values on the schematic.
> 
> I've already discovered that the power supply in a tunnel diode circuit is critical.  Since these Russian diodes I ordered are GaAs, that may affect the operating characteristics as well.  I don't know...  that's something I'll need to learn.  My source voltage to achieve oscillation is about 3v.  The schematic shows 1.5v.   I assume the old General Electric diodes as in the schematic are probably germanium.  I may need to seek out a couple samples.
> 
> Now I'll have to move on to a nice QRP 40m transmitter using proper construction techniques.  :-)
> 
> Perhaps Brian will consider the talk on tunnel diodes for the AMRAD picnic.
> 
> Joe, N6DGY
> 
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