Extracting the 5th Harmonic - revised design
 

Hi all,

Following general agreement that class C might be a better bias
arrangement for the purpose of better harmonic generation, I've posted
a revised circuit to alt.binaries.schematics.electronics which makes
better use of the high input signal level available. Check it out and
let me know what you think.

p.
--

The BBC: Licensed at public expense to spread lies.

On Sun, 14 Mar 2004 14:32:40 +0000, Paul Burridge
wrote:


Hi all,

Following general agreement that class C might be a better bias
arrangement for the purpose of better harmonic generation, I've posted
a revised circuit to alt.binaries.schematics.electronics which makes
better use of the high input signal level available. Check it out and
let me know what you think.

p.

A square wave has lots of 5th and - ideally - no 4th or 6th harmonics.
Going through a class-C stage *adds* in the 4-6 guys, and then you
have to work harder to filter them out. Why do that?

John

On Sun, 14 Mar 2004 14:32:40 +0000, Paul Burridge
wrote:


Hi all,

Following general agreement that class C might be a better bias
arrangement for the purpose of better harmonic generation, I've posted
a revised circuit to alt.binaries.schematics.electronics which makes
better use of the high input signal level available. Check it out and
let me know what you think.

p.

A square wave has lots of 5th and - ideally - no 4th or 6th harmonics.
Going through a class-C stage *adds* in the 4-6 guys, and then you
have to work harder to filter them out. Why do that?

John

On Sun, 14 Mar 2004 09:31:23 -0800, John Larkin
wrote:


A square wave has lots of 5th and - ideally - no 4th or 6th harmonics.
Going through a class-C stage *adds* in the 4-6 guys, and then you
have to work harder to filter them out. Why do that?

For the simple reason that it's dead easy to re-wire the original
board to this new config and see straight away if there's any
indication of 5th. If that should be the case, and having already
built a BPF for the 5th, the problem would be solved for very minimal
effort indeed.
--

The BBC: Licensed at public expense to spread lies.

On Sun, 14 Mar 2004 09:31:23 -0800, John Larkin
wrote:


A square wave has lots of 5th and - ideally - no 4th or 6th harmonics.
Going through a class-C stage *adds* in the 4-6 guys, and then you
have to work harder to filter them out. Why do that?

For the simple reason that it's dead easy to re-wire the original
board to this new config and see straight away if there's any
indication of 5th. If that should be the case, and having already
built a BPF for the 5th, the problem would be solved for very minimal
effort indeed.
--

The BBC: Licensed at public expense to spread lies.