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Rebuilt of Linsley Hood Mosfet amplifier from Wireless World 1982
Rebuilt of Linsley Hood Mosfet amplifier from Wireless World 1982
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Old 14th October 2020, 12:45 PM   #11
gdan is offline gdan  Greece
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Rebuilt of Linsley Hood Mosfet amplifier from Wireless World 1982
The PCB dimensions are 167 mm X 57 mm.

It is a 1.6mm, double-sided PCB, with 70 um copper.
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Old 14th October 2020, 02:13 PM   #12
dadod is offline dadod  Croatia
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Quote:
Originally Posted by gdan View Post
My amplifier is from Wireless World magazine 1982. I never had any problem with oscillations with this amplifier.

Your amplifier is a later design from 1984.
Oscillation was in tens MHz region of very small amplitude and without good oscilloscope you will not noticed during listening.
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Old 15th October 2020, 10:42 AM   #13
gdan is offline gdan  Greece
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Rebuilt of Linsley Hood Mosfet amplifier from Wireless World 1982
As I mentioned in previous post, I never had an oscillation problem with this amplifier.
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Old 15th October 2020, 11:37 AM   #14
dadod is offline dadod  Croatia
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Quote:
Originally Posted by gdan View Post
As I mentioned in previous post, I never had an oscillation problem with this amplifier.
OK, OK!
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Old 20th October 2020, 05:48 PM   #15
Dave S is offline Dave S  United Kingdom
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I like JLH's articles and designs. This was one that I haven't tried before, so I bought a couple of boards from gdan.

The boards are good quality and nicely laid out with good grounding practice etc.
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Old 21st October 2020, 12:45 AM   #16
nigelwright7557 is offline nigelwright7557  United Kingdom
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Hitachi did a datasheet design using similar laterals.
It was used by Maplin who sold hundreds.
I built one in early 1980's.
I revised it recently for my own use.
Same circuit, modern components and decoupled better front end and added DC offset pot.
I have a few pcb's going spare.
Click the image to open in full size.
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2020 versions of PCBCAD51 and PCBCAD720 out now >>> https://www.murtonpikesystems.co.uk
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Old 21st October 2020, 07:28 AM   #17
gdan is offline gdan  Greece
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Rebuilt of Linsley Hood Mosfet amplifier from Wireless World 1982
Quote:
Originally Posted by Dave S View Post
I like JLH's articles and designs. This was one that I haven't tried before, so I bought a couple of boards from gdan.

The boards are good quality and nicely laid out with good grounding practice etc.
Thank you Dave!

I have still a few boards available if someone is interestested to build the J. Linsley Hood amplifier from Wireless World 1982.
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Old 10th November 2020, 07:26 PM   #18
Dave S is offline Dave S  United Kingdom
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I got this amp up and running in my test chassis today.

I have built a lot of amps and must say that the sound of this one is excellent. It is incredibly sweet and tuneful and provides great insight into the music.
I have not detected any of the "mechanical" sound that characterises many amplifiers (however I'm still in the honeymoon period ).
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Old 11th November 2020, 01:15 PM   #19
gdan is offline gdan  Greece
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Rebuilt of Linsley Hood Mosfet amplifier from Wireless World 1982
I fully agree. It is a very sweet amplifier.

Dave, it will be nice, if you could post a photo.
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Old 11th November 2020, 07:27 PM   #20
Holmer is offline Holmer  Germany
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Has anybode noticed the Hitachi circuit is an upside down version of the BUZ-Amp, with an added current mirror to invert the drive for the P-MOS, which makes the drive push-pull. It only uses simple resistor tails for the two LTPs though.
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