Month: December 2020

Today is a interesting, old 5V Zener diode from the early 60s. Its in a metal capsula and made by Intermetall.

This funny voltage regulator tube appeared here, so why not curve trace it?

Halfway there now! Today is a Balast tube, Amperite 9-4.

150V spark gap

108V voltage regulator will be the 2. thermonic element we curve trace.

Notice how its not realy linear on the start up.

Datasheet

Todays picture is a 6D4 Thyratron operating as noise generator.

And with that we are going to do some tube elements.

Todays component is a Germanium NPN transistor 2N1302.

Notice that the linearity isn’t great.

Another interesting curve by swapping around on the connections:

Todays picture is a Triac.

Todays curve is a J310, a depletion mode J-FET.

Todays post is going to be on those Neon bulbs often used as indicators. I had some 65V small neons to play with.

Did you know that a oscillator could be made with a neon bulb as the only active element? This must be the smallest component count oscillator there is?

Oscillation frequency should be close to 1/(2*pi*R*C). If you build this, please let me know how it works for you. The voltage needs to be approximately twice the neon bulb strike voltage, and R1 should preferably be around 1M ohms. Play around with the values and see what you get.

For the next days I think we will do some active components.