I need something on the bench where I can work with without change every time from one to the other apparatus.
It is a combination off four different apparatus, Oscilloscope, Wobbulator, frequency counter and curve tracer.
Starting off with winding the power transformer.
The Frequency counter ( the schematic wobbulator)
Working aluminium sheets to something useful.
Putting everything together.
Mechanical constructing done.
Building off the vertical section and power supply.
Building off horizontal section.
Building TIME DIV.
Building wobbulator.
Building octopus.
The last wiring done on the CRT.
Wiring CRT completed.
Wiring on the power supply completed.
And then the question ?? is it working??
The Scope is working.
Signal from the wobbulator proofs he also is working.
As you can see the signal goes to one side,that means an unbalance in the horizontal section.
The same goes for the vertical section.
The valves used came from the junk box.
After replacing the valves nearly every thing seems to work.
The sign wave is not totally correct I have to look in to that.
After changing the HF coils in the vertical, the problem is corrected.
Now the sign wave looks good.
The signal from the wobbulator 455 Khz.
And the frequency counter is also working.
The original design from the wobbulator only uses one frequency 455khz.
I decided to expand the range to more frequency's.
That means PP practice and patients if you have cross wind the coils.
With some practice it is fairly easy to wind these coils.
Only one coil is known, so your on your own there.
Wind one coil and go from there.
1mH, 398uH,138uH,25 uH coils I made.
Tuning capacitor as indicated in the schematic.
Here the former from 12 mm with four coils.
The value's off the capacitors given in the schematic are far to big,I had quite a job find what works and what not.
It's like winding coils but then somewhat easier.
After some time I was able to expand to 1200 kHz in three bands, now to 3.6 MHz in four bands.
The fourth band needed some further investigation.
After I installed a double switch, to switch the coils and secondly the capacitor C7 the oscillator started to behave.
All four frequency ranges are functioning now.
The first modification done on the wobbulator.
The second modification done on the wobbulator.
The curve tracer is working.
zener diode.
transistor emitter collector
open connection
a short
a capacitor 0,1uF
a diode
a resistor
Further I did modify the bottom connections, one BNC for the frequency counter, and one BNC for the curve tracer octopus.
The signal on the oscilloscope is 3 Mhz well within spec's.
This blog PD3WMZ exists now a number of years now, I made this Channel ON2WMZ that is now available on YouTube:
Video's over a lot of project's restorations building and so on.
Click on the link below and you go Straith to my channel ON2WMZ.
