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Chip Amps Amplifiers based on integrated circuits

An open source layout for LM3886?
An open source layout for LM3886?
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Old 5th August 2018, 09:08 PM   #101
00940 is offline 00940  Belgium
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Going from West to East actually, from Loyola to Manresa, on the Camino Ignaciano.
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Old 6th August 2018, 04:18 PM   #102
tomchr is offline tomchr  Canada
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Nice.
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Old 2nd October 2018, 06:27 PM   #103
00940 is offline 00940  Belgium
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Something I've been toying with. Marginal improvements.

- Now the DC protection is onboard.
- All resistors are 10mm spacing (so no need to order small 1/8w resistors).
- Reverse parallel diodes can be fitted in // with the hum breaking resistor.
- That network can be jumpered.
- The board grew a bit to 60*70mm (from 50*65mm).
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Old 3rd October 2018, 04:49 AM   #104
asuslover is offline asuslover  Romania
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Nice, can we see the schematic?
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Old 3rd October 2018, 07:19 AM   #105
quadfan66 is offline quadfan66  South Africa
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Good to have you back, I hope you had a good trip. I had the last revision of the boards made but am still awaiting delivery. Hope there are not too many changes.
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Old 3rd October 2018, 10:46 AM   #106
00940 is offline 00940  Belgium
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I should probably start a new thread but... what I'm working on currently is adding an opamp stage before the lm3886 on the same pcb, that could be used as either HPF or LPF LR4 filter to create a simple analog crossover and baffle step compensation. Something like 1/4 of the esp09. I think I can fit that in a 7*10cm pcb.
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Old 4th October 2018, 12:21 AM   #107
00940 is offline 00940  Belgium
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Quote:
Originally Posted by 00940 View Post
I think I can fit that in a 7*10cm pcb.
That's gonna be hard without using smd... 7*12cm seems more reasonable. Here is a first draft.

4 opamps sections, with quite a bit of flexibility. The board could be used for bridging, sub summing and filtering, an analog crossover, etc. My aim was to develop something I could easily stick into an active monitor.

- First one can be configured either as a simple buffer/gain stage, as a non inverting summing amp or as a balanced line receiver.
- The sections 2 and 3 (top opamp) can be configured as either hpf or lpf Sallen-Key filters, with 2.54 or 5.08mm spacing caps.
- The last section is a simple gain/buffer. It can be either inverting or non inverting.

Between 3 and 4, there is a level control and after 4 a BSC control.

For power, the idea is to tap the power lines, with a 24V to +/-12V dc-dc converter. 1W ones are quite cheap and sufficient here.
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File Type: png lm3886.png (107.1 KB, 936 views)
File Type: png lm3886-2.png (12.3 KB, 928 views)
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Old 24th October 2018, 12:00 PM   #108
nicotin78 is offline nicotin78  Belgium
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Bsc? Baffle step compensation ? Shouldn't it be followed by another buffer ?

Greetings from Namur
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Old 24th October 2018, 02:18 PM   #109
00940 is offline 00940  Belgium
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Yes, baffle step compensation. A buffer would be needed if the following amp has a low impedance input (lower than about 20k as suggested by ESP). Not a problem here.

I must confess I let this a bit aside for now as my need for it has been delayed. In the meantime, more as a kind of challenge than a serious endeavor, I'm toying with a layout for a zd-50.
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Old 24th October 2018, 04:30 PM   #110
spaceistheplace is offline spaceistheplace
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Perhaps start a new thread and link the two in the OP?

I think many would be interested in this board as a stand-alone entity.

Would keep the conversation more linear.
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