Best,

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- Thread starter soundsactive
- Start date

Best,

Someone had the schematics to build from , did they get posted to our archives ?

And that TG website is kool... those where great desks...

Thanks,

Thomas

Thank you

Great! Thanks!

Not we need to figure out the inductors' value....!

Not we need to figure out the inductors' value....!

Jakob E.

gyraf said:'tis one?

Yes, thank you very much

THANK YOU!Hope this helps:

The nominal frequency of shelf eq's is NOT the turnover ffequency of the associated filters. The listed frequency is where the max boost cut happens, so it's typically about 3 octaves above or below the 3dB point.Is anyone willing to help me understand the low shelf topology/function and how to calculate those frequencies? When I calculate them as LR filters, I'm getting way lower cutoff frequencies than are listed.

Thank you! Makes way more sense now.The nominal frequency of shelf eq's is NOT the turnover ffequency of the associated filters. The listed frequency is where the max boost cut happens, so it's typically about 3 octaves above or below the 3dB point.

Looking between the TG12414 and the TG12412, I noticed some distinct differences with the circuits. It looks like the signal at the first stage (bc109 and bcy71) of the TG12414 are biased to a negative voltage while the first stage of the TG12412 are biased to a positive voltage. Is that accurate? What reason would these two circuits be different when (I assume) they were used in the same desks?

If I gave you a Mathematica spreadsheet that accurately calculates them as s-domain laplace transforms would that help? The complication here is the inverting stage gain, which shifts the frequencies a little bit compared to a passive circuit.Is anyone willing to help me understand the low shelf topology/function and how to calculate those frequencies? When I calculate them as LR filters, I'm getting way lower cutoff frequencies than are listed.

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