Another sitar circuit

[col]

I didn't want to jump Darrons thread so I'll post this here. I just found this in a copy of Practical Electronics from March 1967 I bought today from a second hand bookshop. has anyone seen it before or better still tried it? How does it work?

http://s159.photobucket.com/albums/t159/col07768/?action=view&current=sitar.jpg

I'm facinated by these old articles!

[jlullo]

wow that looks really cool!  and it seems quite simple

[gez]

Earphones, how cool is that?!

Do they still sell those awful things you used to get back in the day??  No doubt there's some mojo to them...modern ones just don't cut it! 

[DDD]

Simple but elegant principle, cool!

[darron]

okay. now that's cool! let's give that a shot. the other thread i started wasn't really meant to be a sitar emulator, but i thought the recordings sounded like one (:

this sort of crazy unconventional stuff like the headphones is what i really love. i guess people thought similar things about the spring reverb and optical tremolo when they first came out?

if someone can make this i'd love to hear some samples. i have a few ge's lying around so i guess i could make on with them

[Pedal love]

Hey a new method of coupling....earphone to earphone. 

[mattpocket]

yeah, what does that do? using two earphones?

Matt

[darron]

yeah, what does that do? using two earphones?

Matt

it's say one is going to give the output of the signal. acting as a coupler the output earphone will create an electromagnetic wave rather than a fluctuating voltage, the wave would then get picked up in the other earphone like a microphone. then again it might just be sound? but i don't think that would be very practical. i suppose this might give a twangy sort of distortion?

it would be like when you put a powered speaker like from your mobile phone or an earphone from a portable music player up against your guitar pickup and play music through your amp

any better/other thoughts on the operation of the circuit?

[gez]

A couple of transducers would probably do, though you might need to cut them down a little?  If anyone rembers the old style earphones they were pretty tinny, so that's probably where a lot of the 'sitar' sound is going to come from.

[gez]

Find another one of these and you're smiling!

http://cgi.ebay.com/Trancel-60s-6-Transistor-T-11-Radio-w-case-earphone_W0QQitemZ220107406245QQihZ012QQcategoryZ932QQcmdZViewItem

[darron]

Find another one of these and you're smiling!

http://cgi.ebay.com/Trancel-60s-6-Transistor-T-11-Radio-w-case-earphone_W0QQitemZ220107406245QQihZ012QQcategoryZ932QQcmdZViewItem

i've got another one of those lol.

i prefer that style of earphone too... i have some sennheiser that are like that (in concept) as well as one that looks just like the pic. it's the sort used for crystal passive am radios

[spudulike]

You need two of these




£0.99p each ...

[mattpocket]

You reckon you'd need to take the plastic away to get the speakers closer together?

Matt

[spudulike]

The earpieces unscrew, and you can remove the plastic around the internal diaphragm if you need to.

[gez]

The earpieces unscrew, and you can remove the plastic around the internal diaphragm if you need to.

Yeah, if I recall there's a little diaphragm in there and, presumably, you'd glue them face-to-face, which is why I suggested using (disc) transducers, but if those little earpieces are still available...

[gez]

PS  Stick one of those earpieces in your mouth and you get a (very) primitive talk box.  Did this in my 'yoof' and it does work (though not very loud).

[darron]

PS  Stick one of those earpieces in your mouth and you get a (very) primitive talk box.  Did this in my 'yoof' and it does work (though not very loud).

we found out one night that the ruby amp is alright for that haha

[Mark Hammer]

That schematic you posted is just....well...creepy.  Those are my initials, but I have only one M and I've never been to England, let alone Bath.  Still, weird to see something so close to one's name associated with something like that.

It's not clear whether we are talking about crystal earphones, or dynamic/magnetic ones.  Many of the older dynamic, coil-based units (usually the "white" ones with a long white cord that came with televisions and radios) essentially had a thin sheet-metal disc that sat atop the magnetic structure.  In past, I've found that the high frequency response could be improved if you gently popped those off and ground them down a bit on an ultra-fine grinding stone to reduce their thickness and increase their pliability.

[darron]

That schematic you posted is just....well...creepy.  Those are my initials, but I have only one M and I've never been to England, let alone Bath.  Still, weird to see something so close to one's name associated with something like that.

It's not clear whether we are talking about crystal earphones, or dynamic/magnetic ones.  Many of the older dynamic, coil-based units (usually the "white" ones with a long white cord that came with televisions and radios) essentially had a thin sheet-metal disc that sat atop the magnetic structure.  In past, I've found that the high frequency response could be improved if you gently popped those off and ground them down a bit on an ultra-fine grinding stone to reduce their thickness and increase their pliability.

how much fricken time do you have on your hands there ? rofl.

sorry... i don't mean to sound rude.... you've really gotten down to all the nitty grittys! it's good to have someone with so much experience around (:

[GREEN FUZ]

Seems I`m not the only one interested in this circuit. I`ve been inspired to have a go at a layout ( my first so no laughing at the back   ). I`m no good at reading schematics so I `ve cobbled this together as best I can. Will it work ? The more I look at it the more doubtful I become, particularly in the area of the earpieces, pot and switch. I would very much appreciate someone with more experience giving it the once over as I really want to give this a go.



Any comments, corrections, advice, welcome.