I build this just because i wanted a quick and easy project to kill some time.

I found the schematics online (PH2LB and Here).

All the necessary parts i had laying around.

In the end it looked like this:

It give a fair a mound of “Noise” according to my scope.


I have put it in a little enclosure, also i tried it on my frequency counter. It seams to resonate around the 1.7 Mhz.


R1 => 10K
R2,R4R6R8 => 1.2K
R3,R5,R7 => 22K

C1,C2,C3,C4 => 0.01uf ceramic

D1 => LED
D2 => 1n51A 5.1v Zener

Q1,Q2,Q3 => 2N2222

BNC Chassis
On -Off switch

Experimenteer print