Homemade Oscilloscope from T.V.

[13579]

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[negz]

I didn't get any of the steps but that's fucking awesome.

[MunkeyQ]

Incredibly awesome!

I've heard that it can be done, but never seen it actually carried out and working. Nice one!

[phmeworp]

Good job & kudos!

I assume you are using the existing vertical deflection circuit for horizontal sweep (just rotating the yoke 90 degrees)?

Something you might give a try if/when you get bored, is to connect the left channel of a stereo to vertical and right to horizontal... makes some neat lisijous (sp) patterns. Only problem is that with no sound you will need some sort of blanking circuit to avoid a bright spot in the CRT center... or you could just ignore that and let the beam burn a hole in the phosphor at that point = automatic 'blanking'.

Again, great job.

[13579]

Good job & kudos!

I assume you are using the existing vertical deflection circuit for horizontal sweep (just rotating the yoke 90 degrees)?

Something you might give a try if/when you get bored, is to connect the left channel of a stereo to vertical and right to horizontal... makes some neat lisijous (sp) patterns. Only problem is that w0ith no sound you will need some sort of blanking circuit to avoid a bright spot in the CRT center... or you could just ignore that and let the beam burn a hole in the phosphor at that point = automatic 'blanking'.

Again, great job.

Thanks, I'll try that next time I take it apart. And I just switched the wires so the horizontal coil is attached to where the vertical should be, and audio is sent to the vertical coil.

The horizontal output required a dummy coil or the TV would auto-shutoff.

[phmeworp]

Thanks, I'll try that next time I take it apart. And I just switched the wires so the horizontal coil is attached to where the vertical should be, and audio is sent to the vertical coil.

The horizontal output required a dummy coil or the TV would auto-shutoff.

Yeah, on more modern sets using voltage tripplers it is not quite so critical, but on older units, the horizontal deflection was closely tied to the resonant frequency of the horizontal yoke coil (15,750 Hz +/-).

As a side note, when I was a kid (circa 1968) I modified a TV into a strobe light using a UJT oscillator for the CRT keying. Okay, now that we have all taken a break to laugh at the "hippie old fart".

There is a significant impedance difference between the horizontal and vertical windings on a defelction yoke. But you seem to have more than an adequate handle on such things... so, carry on my young friend and have fun with your project; you have learned much, and will learn much more as you play with your experiment. Such are the building blocks of which future knowledge is built.

Go forth and learn........

[13579]

Yeah, on more modern sets using voltage tripplers it is not quite so critical, but on older units, the horizontal deflection was closely tied to the resonant frequency of the horizontal yoke coil (15,750 Hz +/-).

As a side note, when I was a kid (circa 1968) I modified a TV into a strobe light using a UJT oscillator for the CRT keying. Okay, now that we have all taken a break to laugh at the "hippie old fart".

There is a significant impedance difference between the horizontal and vertical windings on a defelction yoke. But you seem to have more than an adequate handle on such things... so, carry on my young friend and have fun with your project; you have learned much, and will learn much more as you play with your experiment. Such are the building blocks of which future knowledge is built.

Go forth and learn........

Hah, wow.... Sounds like you were an interesting kid :)

I'd say I'm just starting out. I've been playing with coilguns and such for a few years (I'm 15 now, starting to get into more complicated things)

Thanks for the encouragement, next time I do something like this, I'll be sure to post it.

[emag]

Awesome! Thanks for posting.

Do you know if this can be done with a computer monitor? I have 3 old ones and parts from a few monitors and TV's that I've taken apart that I've been saving to do something like this with. (yes, I've already built a Jacob's ladder)

[Dfg]

I got most of the steps, (i am actually not very good with electronics but i can learn :)). A step by step guide will be really helpful.

[13579]

Just looking back through the DIY pages...

Since my first post, I've improved upon the wires and re soldered a audio input jack and a few other features. Fun thing to play with when bored.