output stage with high impedance - Page 6

alex0 · 10th September 2003, 07:21 AM

In this patent for current-drive authors used bridge of one amplifier as voltage-source and other - as current-source. Patent in Djvu-format in Russian with abstract in English.

454Casull · 31st October 2011, 04:37 PM

Are there any DIY kits or plans for a decent (low distortion, very low high-order HD or IMD) current source amp?

sbrads · 31st October 2011, 10:12 PM

Quote:

Originally Posted by 454Casull

Are there any DIY kits or plans for a decent (low distortion, very low high-order HD or IMD) current source amp?

I would have thought an 8 year old abandoned thread would be a good indicator of there being no plans.

I briefly tried high impedance drive on a 3-way once - it sounded awful.

Ian Finch · 31st October 2011, 11:27 PM

Hi 454Casull
Your fellow Canadian member Duo started to plan a kit for a very interesting variable impedance current drive amp last year. It had received some favourable comments.

'Not heard his progress since then as he was setting up a website - perhaps he would be good to contact.

MarcelvdG · 1st November 2011, 05:40 AM

My experimental current-driven loudspeaker with motional feedback from a second voice coil worked rather nicely. Pity I didn't have a practical application for it.

Another way to get rid of the response peak around fundamental resonance is to just equalise it out with a filter (Linkwitz transform circuit or other type of filter with two zeroes and two poles). The problem with this is that the filter zeroes will never be exactly on the loudspeaker poles. As a result, you will get some small ringing that damps out slowly.

31st October 2011, 04:37 PM	#52
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Are there any DIY kits or plans for a decent (low distortion, very low high-order HD or IMD) current source amp? __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

31st October 2011, 11:27 PM	#54
Ian Finch diyAudio Member Join Date: Apr 2010 Location: Coffs Harbour, on the east coast	Hi 454Casull Your fellow Canadian member Duo started to plan a kit for a very interesting variable impedance current drive amp last year. It had received some favourable comments. 'Not heard his progress since then as he was setting up a website - perhaps he would be good to contact. __________________ regards

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1st November 2011, 05:40 AM	#55
MarcelvdG diyAudio Member Join Date: Mar 2003 Location: Haarlem, the Netherlands	My experimental current-driven loudspeaker with motional feedback from a second voice coil worked rather nicely. Pity I didn't have a practical application for it. Another way to get rid of the response peak around fundamental resonance is to just equalise it out with a filter (Linkwitz transform circuit or other type of filter with two zeroes and two poles). The problem with this is that the filter zeroes will never be exactly on the loudspeaker poles. As a result, you will get some small ringing that damps out slowly.

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