X-Authentication-Warning:	delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] on-topic Question wrt driving HV piezo transducer
To:	geda-user AT delorie DOT com
References:	<c3aa1897-3806-3f72-feef-85551a63c2db AT linetec DOT nl>
	<alpine DOT DEB DOT 2 DOT 00 DOT 1802091235090 DOT 12270 AT igor2priv>
	<6221de93-bb98-d397-79b4-eecf3975c2e6 AT linetec DOT nl>
	<alpine DOT DEB DOT 2 DOT 00 DOT 1802091324350 DOT 12270 AT igor2priv>
	<f2259553-7015-8fc8-33b2-8ca8be6c5a45 AT linetec DOT nl>
	<alpine DOT DEB DOT 2 DOT 00 DOT 1802091427450 DOT 12270 AT igor2priv>
	<20180209161532 DOT 6AF57804CEFA AT turkos DOT aspodata DOT se>
	<alpine DOT DEB DOT 2 DOT 00 DOT 1802091735590 DOT 12270 AT igor2priv>
	<20180209204934 DOT CAA35804CEFA AT turkos DOT aspodata DOT se>
	<alpine DOT DEB DOT 2 DOT 00 DOT 1802100406500 DOT 12270 AT igor2priv>
	<b125c1d5-48a1-c1dc-3ee1-db9875d50bf6 AT linetec DOT nl>
	<03bf4a8a-ef40-e50d-ba5e-0ce9730ecaaf AT ecosensory DOT com>
From:	"Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Message-ID:	<f438a808-d6ad-485d-0fe0-6f903c196797@linetec.nl>
Date:	Sat, 17 Feb 2018 15:47:33 +0100
User-Agent:	Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
	Thunderbird/52.6.0
MIME-Version:	1.0
In-Reply-To:	<03bf4a8a-ef40-e50d-ba5e-0ce9730ecaaf@ecosensory.com>
Reply-To:	geda-user AT delorie DOT com
Errors-To:	nobody AT delorie DOT com
X-Mailing-List:	geda-user AT delorie DOT com
X-Unsubscribes-To:	listserv AT delorie DOT com

Hello John,

Op 15-02-18 om 22:27 schreef John Griessen (john AT ecosensory DOT com) [via 
geda-user AT delorie DOT com]:
> ...
> No, that's not really off topic since I have a project with circuitry 
> like you want, and with plans to do
> well calibrated feedback controlled HV from python programs...
>
> It's made using gschem, pcb-rnd (evolved from pcb), and volt doubler 
> partsimulated with gnucap.

[snip links]

Browsed around for a bit, interesting project!


I'm looking into transformer design specifics right now, and of course a 
lot of questions come up, e.g. what core material to use, and what to do 
about an air gap. If I have 4 turns primary(*), and thus 400 turns 
secondary, a rather low Al of even 250 will result in a secondary L 
value of 250x400^2= 40 mH. I wonder if this is a problem or not (no, I'm 
really not good with transformers at all).

But if I understand correctly, I can effectively halve the turns ratio 
with a center-tap design, which should improve things quite a bit.

I also found this calculator: 
http://www.dicks-website.eu/coilcalculator/index.html
When I enter some parameters from commercially available cores, it comes 
up with some pretty realistic figures, supporting the notion that I 
should try and keep the turns ratio at 1:50 max. to keep primary 
currents and overall transformer losses within reasonable limits.

Anyway, I'll order some cores and see what they do.

Best regards & thanks for all your input,

Richard

- Raw text -