Lingo schematic

[resolution]

Does anyone have a schematic for a linn lingo.
I have the oppertunity to buy a dead one cheap.

regards

res

[EC8010]

I'd be curious to see the diagram of a Lingo. But if you have a dead one in your hands, it wouldn't be difficult to trace the circuit. A turntable power supply isn't rocket science.

[andyr]

Originally posted by EC8010
I'd be curious to see the diagram of a Lingo. But if you have a dead one in your hands, it wouldn't be difficult to trace the circuit. A turntable power supply isn't rocket science.

I believe the Lingo is not the simple beast you might imagine from the name "t/table PS".

It's basically morphed from one of their power amps.

Regards,

Andy

[analog_sa]

It took me a surprising amount of effort to draw a circuit off a simple Valhalla. Still, in the interest of science, if someone provides high-res pics of the Lingo i guess i'll do it.

[FrankGales]

From the pics of the internals I saw it is no rocket science. A crystal oscillator using standard CMOS chips followed by an amp.
It should at least be easy to track down what is not working. The oscillator or the amp. So it depends on the price and your electronics experience if you want to take the risk or not.

Technically the Manticore MB6 is a much better design. It creates a stepped sine wave and has the phase shift done in the digital part or the circuit, not by a cap like the Lingo.

Have fun,
Frank

[analog_sa]

by a cap like the Lingo

Does the Lingo really use a cap? It certainly has separate amps for the two phases and knowing how easy it is to get a second phase digitally generated (and at tunable angle) i find it difficult to imagine why use a cap.

[FrankGales]

Does the Lingo really use a cap?

Well at least the old Lingo did to my knowledge. I'm not that sure if the old Lingo had two amps.

Manticore MB6 uses a CMOS shift register to make a stepped sinus (AFAIR a similar circuit is in the CMOS cookbook). Well it usees two shift registers oe for the sine and triggered from this one the second one for the cosine. Nice design.

C ya,
Frank

[EC8010]

According to Linn's home page, the Lingo uses one crystal oscillator for 33 and another for 45. The square wave is divided down and filtered to produce a sine wave which is then applied to a pair of Class A amplifiers, one of which is preceded by a 90 degree phase shift network.

[analog_sa]

'Phase shift network' should mean a capacitor. I wouldn't mind having one of these for couple of hours just to take a look at the amp stages. The synthesising can be done in a much better way these days. My prototype from almost two years ago used a microcontroller with a look-up table, two 8-bit dacs and filters. The sinewaves had very little distortion (almost as good as a Wien bridge) and phase shift could be chosen at random or 'by ear'. Still better would be to use a dsp.