Making a very simple oscilloscope Pt. 9: VLOG + schematic showed (without Horiz. & Vertical amps)
Please read the description/textbox first. Part 9 of the development of a very (read: very…) simple oscilloscope, made with the DG 7-32 CRT. I now show the complete schematic, but without the horizontal and the vertical amplifiers, thus the X and Y amplifiers.
Update (31 okt 2022): used the earlier published sawtooth genarator, could get it working. Though now (31 okt 2022) it needs more eleboration, circuit was not ripe enough to publish it on YT.
Please be aware: even without the classical X and Y amplifiers you can do many tests and experiments! Send signals directly to the plates, don't connect one of the hor-vert plates to ground, leave it as it is, so all plates to ground via that 120 K resistors.
With sinusoidal voltages in the order of 40-60-100 Volts on the horizontal plates (sent in via 330 N/300 V non polar capacitors) you can make many electronic/electrical phenomenon visible, say at the same time sending an AC signal to the vertical plates, also via these separation capacitors of say 330 N/300 V (watch the schematic in the video).
In a 1943 book I read: when a sinusoidal voltage is "smeared" out on the hor. plates (high deflection voltage) you can use it as a time base (related to the signal on the vert. plates) because a certain part of the sinusoidal wave is somewhat linear.
You can also, with the showed setup, add DC voltages to the horizontal and vertical plates directly.
That is why I have mounted, on the front, the electrodes (m3 bolts) that go directly to the plates, horizontal and vertical.
That makes it possible to do DC experiments/tests of electronic components, etc.
It makes it possible to connect DC amplifiers/DC voltages directly to the horizontal and vertical plates, given the fact that all plates are connected via a (“DC”) resistor of 120 K to ground/zero/mass.
Final thing in this project will be to make the horizontal and the vertical amplifier, that both have to work in the order of 80 Volts to 100 Volts (perhaps higher, max 200 V), to give enough deflection on the X-Y plates.
And the triggering of the sawtoothgenerator (to make the waveform that we want to study “stand still” on the screen) will also be an issue. It will take some time from now, 25 October 2022.
About this series of video’s:
Part zero : • Talking about a Cathode Ray tube with... (about the DG 7-32 CRT tube, 1 october 2022, how to get a CRT working)
Part 1: • High Voltage circuit 1KV- 4KV for an ... (about HV circuits on 16-18 KC, made with a line transformer on 16 KC, principles & schematic, first idea’s 1 october 2022)
Part 2 : • Making a very simple oscilloscope Par... (first setup, some common things to tell about a CRT circuit, video named part 2, on 5 october 2022)
Part 3 : • Making a very simple oscilloscope Par... (shielding the tube for EM influences, common things, 6 october 2022)
Part 4: • Making a very simple oscilloscope Pt.... (schematic of a HV generator on 16-18 KC, with a line CRT transformer, 16 KC, made with 2 x 2955 end transistors, A stable Multivibrator, schematic, 13 october 2022)
Part 5: • Making a very simple oscilloscope Pt ... (showing some solutions, High Voltage say 380 V DC with a few simple mains transformers, working on 50 Hz or 60 Hz, 15 october 2022) Part 6: • Making a very simple oscilloscope Pt ... (about the filament voltage circuit, 6 V at 300 mA, 18 oct. 2022.
Part 6: the 6.3 Volt at 300 mA filament voltage
• Making a very simple oscilloscope Pt ...
Part 7: proper connections of the brightness & focus grid in the CRT • Making a very simple oscilloscope Pt ...
Part 8: VLOG, moving the dots & lines on the CRT screen • Making a very simple oscilloscope Pt ...
Part 9: this video, definite schematic about the internal voltages inside the DG 7-32 CRT; brightness, focus, etc.
Sawtooth generator of the earlier YT video (oct 2022) is here • What to do with a sawtooth generator ...
Another very simple oscilloscope made with the DG 10-6 CRT is in my book “Schematics 3, Transistor switches generators and cathode ray tube circuits”. ISBN 978-1-4476-1164-6.
Or lulu content nr 10469565 on the LULU website, search for author “Ko Tilman” there. Pages 32-53.
My You Tube channel trailer is here: • Radiofun232 on YouTube. Updated month...
When you search, search always “NEWEST FIRST” to get the right overview. You can also search via the “looking glass” on my Channel trailer via keywords like ”audio”, “radio”, “amplifier”, “filter”, “Shortwave”, “transistor”, “FET”, “oscillator”, “generator”, “switch”, “schmitt trigger” etc; so the electronic subject you are interested in.
My books about electronics & analog radio technology are available via the website of "LULU”, search for author “Ko Tilman” there.
https://www.lulu.com/search?adult_aud...
I keep all my YT videos constant actual, so the original video’s with the most recent information are always on YouTube. Search there, and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. Upload 25 October 2022.
