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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
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Old Today, 12:39 AM   #2861
gaborbela is offline gaborbela  Canada
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I would like to order a couple of those also.
Maybe 4-6pc.
X where did you ordered yous if you do not mind to share the info and the gerbers.
Thank you
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Old Today, 04:59 AM   #2862
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Quote:
Originally Posted by AKSA View Post
Hi X,

That 'M2' cap multiplier is impressive. Could you please put up the schem again, there were a few changes...... I love Prasi's pcb too, elegant.

An IRFP240 will run with 38W and passive cooling for more than 25 years. But at 90W you'd need liquid cooling for a reasonable MTBF to avoid overheating the junctions. If you use passive cooling (my preference) you have to have either a TO264 or an ice puck device, that' HOT.

Thank you for your wonderful energy on the forum, X. You have done a huge service to the community.

HD
Here is the schematic for the layout (design by Mark Johnson, and modified by Gtose):
Click the image to open in full size.

Here is the LTspice schematic by Gtose:
Click the image to open in full size.

Layout by Prasi:
Click the image to open in full size.

More in the Easy Peasy thread:
Juma's Easy-Peasy Capacitance Multiplier

Gerbers are posted in the above thread around post 512. These can be made as "add on" orders if you are already getting something at JLCPCB for $2 for qnty 10.
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Old Today, 09:03 AM   #2863
AKSA is offline AKSA  Australia
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Thank you, X!

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Old Today, 02:21 PM   #2864
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
The cap multiplier above works phenomenally well. Just real basic parts - I am thinking of converting it to lower current (300mA) HPA duties using a smaller and less expensive TO220 BJT for the output. Just using a 10mF input smoothing cap was enough for running 1 channel for the M2 at 1.27amp bias current and about 2v drop. Note that the dropout voltage needs to be greater than the input ripple plus 1.2v in order for the cap Mx to be able to absorb the ripple. So at 2v drop I can have up to +/-400mV ripple on the input.
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