Return-Path: Received: (qmail 22618 invoked from network); 4 Nov 2002 09:34:58 -0000 Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 4 Nov 2002 09:34:58 -0000 Received: (qmail 26094 invoked from network); 4 Nov 2002 09:36:06 -0000 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 4 Nov 2002 09:36:06 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 188dar-0003py-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 04 Nov 2002 09:32:25 +0000 Received: from [62.253.162.47] (helo=mta07-svc.ntlworld.com) by post.thorcom.com with esmtp (Exim 4.10) id 188dar-0003pp-00 for rsgb_lf_group@blacksheep.org; Mon, 04 Nov 2002 09:32:25 +0000 Received: from default ([62.253.48.126]) by mta07-svc.ntlworld.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with SMTP id <20021104093222.UKSH1554.mta07-svc.ntlworld.com@default> for ; Mon, 4 Nov 2002 09:32:22 +0000 Message-ID: <005d01c283e4$fe6354e0$7e30fd3e@default> From: "Tracey Gardner" To: rsgb_lf_group@blacksheep.org References: <2D280BB697C7EE4C979C5C89925418EF368F37@TNS-FBU-2E-003.corp.telenor.no> Date: Mon, 4 Nov 2002 09:10:51 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: Siemens D2006 Selective Level Meter/Pelelmesser Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=0.2 required=5.0tests=REFERENCES,SPAM_PHRASE_01_02,USER_AGENT_OEversion=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Hi Jan_Martin I've got a similar problem with my level meters, they all seem to output tones between 1000Hz and 1500Hz. I'm considering using a cheap "Voice Modulator" IC the HT8950 from Holtek on the output. This is a simple 18 pin device designed for use in toys, but it offers the ability to divide a tone by certain fixed ratios. ISTR that they are 8/9, 4/5, 2/3 so that your 1000Hz could be reduced to say 666Hz with a single HT8950. If you were to daisy chain two or more 8950's you could come up with any number of combinations! It also does "Robot" and "Vibrato" effects but I can't see those being much use to us! :-) The 8950 is available in Maplin over here in the UK for about £2.50 and I found the application notes on web by doing a search on Google. 73s Tracey Does somebody know if it is possible to change the pitch? It has 80Hz as well as 3100Hz bandwidth, but the pitch is ca 1000Hz and not too pleasant to listen to, would rather prefer 500Hz