Recent content by Doc Orion

That's because I never posted them anywhere else. Mostly nobody believes it works so screw them! Heh, heh... I'll post them here as soon as I can, but that's about it. Even so, I don't have the complete circuit; my files are missing the power converter sub-cuircut that bossts 3 volts up to the...

When things settle down a bit I'll post the schematics for the Screwdriver, but there may be a problem: the XR2206 chip has been discontinued! that IC is the sweep modulator and critical to the design. I thought it would be around forever-- but what do I know? :redface: Doc

After being homeless for several long and painful months, I finally have a place and will be settled in sometime by next month. I managed to keep my screwdriver files with me, though not much else, so if anybody still wants to see pictures of the circuitry I'll probably have them posted between...

Considring all the mayhem that's going on in my life right now you are really lucky I managed to take the time to lay the screwdriver out in sections like this.

I can't find a schematic for the last sub-circuit but it is one of the easiest push-pull amplifiers: 1. One 2. 2K resistor goes from CD4046 output pin 2 to the base of Q1. The other 2.2K resistor goes from output pins 3 & 4 to the base of Q2. 2. The collector of Q1 is connected to one...

I'm going to give the link to the VCO, then go to bed; it's now 5:00 am so it's past my nappy time. The VCO circuit can be found here...

Start with the XR2206 sub-circuit...

That screwdriver does everyting but make coffee! Mine only turns screws-- and the occasional dinner plates... :-) 'Doc

My life is extremely complicated right now so I don't know when-- or if-- I'll be able to do any kind of photos but here's the parts list except for the power converter. It's the best I can do for now. Basic Sonic Screwdriver Circuit B1 9v battery IC! XR2206 function generator IC...

I was lucky: by accident, I found the hard copy for most of my Screwdriver files. I even offered to copy them for a few folks-- all I asked for was a SASE (self-addressed stamped envelope), but what I got was people who wasted my time. As Scotty once said, "Fool me once, shame on you. Fool me...

I have to say that while it's the best I can do, it is a bit crude. But unless one has access to Time Lord technology, it's hard to get sophisticated ciruitry to fit into a sleder tube. Since the orignial device, it has occurred to me that I could probably get more acoustical power from a...

The finished circuit board for the screwdriver is roughly 6" x 1/2" -- this is just a hand wired piece of perf board where all the miniature components are either soldered directly to each other or connected by a few pieces of 24 gauge or thinner hook-up wire. Somebody more experienced in...

When I first started out I had a number of engineering directories which had some amazing items listed that weren't your usual consummer products. It's been a long time but they are still around, a 12 kHz piezo transducer that's not quite perfect for the Screwdriver, but very close to it...

For those a ittle too lazy to do it physically, here's an idea: get a copy of the Cool Edit program. This does a lot of things with sound-- for example, it can be set to generate a sine wave of a given frequency and modulate it with another to get the sound the Doctor's Screwdriver makes or the...

Okay... I was going to keep this secret until 2022, but doing some much needed cleaning I stumbled across a binder with 95% of the working drawings for the Screwdriver. It's unfortunately missing two things: the drawings for the sound-head, and the bottom end cap/ frequency control knob...