Path: csiph.com!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Don Kuenz Newsgroups: sci.electronics.design Subject: Re: How to increase the volume of a metronome? Date: Mon, 13 Feb 2017 19:47:15 -0000 (UTC) Organization: A noiseless patient Spider Lines: 144 Distribution: world Message-ID: <20170213d@crcomp.net> References: <20170213a@crcomp.net> Injection-Date: Mon, 13 Feb 2017 19:47:15 -0000 (UTC) Injection-Info: mx02.eternal-september.org; posting-host="2eced9cbef81c239930a640cc3c023bf"; logging-data="32512"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19YGzN++4JSG9ocniVtSzF6" Cancel-Lock: sha1:Np7hNrOPKnZ7mkN35rJrXIQV0NA= Xref: csiph.com sci.electronics.design:447582 Tim Wescott wrote: > On Mon, 13 Feb 2017 15:28:06 +0000, Don Kuenz wrote: > >> Greetings, >> >> Comments are sought on additional circuitry to increase the speaker >> volume of the circuit shown between the lines. Comments on circuit >> simplifications are also sought. (Maybe a 555 with a couple of pots is >> as simple as it gets sometimes?) >> >> The Tempo1/Tempo2 resistor pair signifies a pot as does the Vol1/Vol2 >> pair. Is there a better way to capture pots with LTSpice? >> > > Your newsreader has mangled the file by taking out the linefeeds -- I was > going to take a second look, but I'd have to slave over it to > reconstitute. > > At any rate, from experience: you want lots of high frequency content to > get a "tick" instead of a "thump". If you're using a speaker this means > delivering a very narrow impulse to the speaker, and using a speaker that > has good high-frequency characteristics. Fortunately, it also means that > you don't need an amplifier in the classic sense -- you can have a simple > one-transistor "pull it down hard and let go" amplifier, or a slightly > less simple class B pair, and don't worry about crossover distortion. > > I'd handle volume either by changing the final stage final voltage, or by > modulating the length of the (very narrow!) pulse I send to the final > stage. The second method will change the frequency content -- as it gets > louder it'll be more of a "thud" than a "tick", but try it, you might > like it. Let's see if linefeeds "Windows style" works this time: ------------------------------------------------------------------------ Version 4^M SHEET 1 960 936^M WIRE -384 96 -512 96^M WIRE -288 96 -384 96^M WIRE 64 96 -288 96^M WIRE 112 96 64 96^M WIRE 304 96 112 96^M WIRE 112 112 112 96^M WIRE -384 128 -384 96^M WIRE -288 192 -288 96^M WIRE -240 192 -288 192^M WIRE 112 192 112 176^M WIRE 112 192 -16 192^M WIRE 112 224 112 192^M WIRE -384 256 -384 208^M WIRE -240 256 -384 256^M WIRE 16 256 -16 256^M WIRE -384 304 -384 256^M WIRE -240 320 -320 320^M WIRE 176 320 -16 320^M WIRE 176 336 176 320^M WIRE 304 368 304 96^M WIRE -240 384 -288 384^M WIRE 64 384 64 96^M WIRE 64 384 -16 384^M WIRE 240 416 176 416^M WIRE -384 448 -384 384^M WIRE -320 448 -320 320^M WIRE -320 448 -384 448^M WIRE 16 448 16 256^M WIRE 16 448 -320 448^M WIRE -512 464 -512 96^M WIRE -384 480 -384 448^M WIRE -288 480 -288 384^M WIRE 304 496 304 464^M WIRE 176 512 176 496^M WIRE -512 592 -512 544^M WIRE -384 592 -384 544^M WIRE -384 592 -512 592^M WIRE -288 592 -288 544^M WIRE -288 592 -384 592^M WIRE 304 592 304 576^M WIRE -512 640 -512 592^M FLAG -512 640 0^M FLAG 112 224 0^M FLAG 176 512 0^M FLAG 304 592 0^M SYMBOL Misc\\NE555 -128 288 M0^M SYMATTR InstName U1^M SYMBOL res -368 112 M0^M SYMATTR InstName Tempo1^M SYMATTR Value 125k^M SYMBOL res -368 288 M0^M WINDOW 0 36 43 Left 2^M WINDOW 3 49 74 Left 2^M SYMATTR InstName Tempo2^M SYMATTR Value 125k^M SYMBOL cap -368 480 M0^M WINDOW 0 -23 6 Left 2^M WINDOW 3 -41 58 Left 2^M SYMATTR InstName C2^M SYMATTR Value 2.2\xb5F^M SYMBOL res 160 320 R0^M WINDOW 0 -92 42 Left 2^M WINDOW 3 -88 69 Left 2^M SYMATTR InstName Vol1^M SYMATTR Value 500^M SYMBOL Misc\\battery -512 448 R0^M WINDOW 0 12 95 Left 2^M WINDOW 3 17 9 Left 2^M WINDOW 123 0 0 Left 2^M WINDOW 39 0 0 Left 2^M SYMATTR InstName V1^M SYMATTR Value 9^M SYMBOL cap -304 480 R0^M SYMATTR InstName C3^M SYMATTR Value 0.1nF^M SYMBOL cap 96 112 R0^M SYMATTR InstName C4^M SYMATTR Value 100\xb5F^M SYMBOL res 160 400 R0^M WINDOW 0 -86 47 Left 2^M WINDOW 3 -87 76 Left 2^M SYMATTR InstName Vol2^M SYMATTR Value 500^M SYMBOL npn 240 368 R0^M SYMATTR InstName Q1^M SYMATTR Value 2N3904^M SYMBOL res 288 480 R0^M SYMATTR InstName Speaker^M SYMATTR Value 8^M TEXT -392 616 Right 2 !.tran 1 uic^M TEXT -8 176 Left 2 ;1^M TEXT -8 240 Left 2 ;2^M TEXT -8 304 Left 2 ;3^M TEXT -8 360 Left 2 ;4^M TEXT -296 368 Left 2 ;5^M TEXT -296 304 Left 2 ;6^M TEXT -296 240 Left 2 ;7^M TEXT -296 176 Left 2 ;8^M ------------------------------------------------------------------------ Thank you, -- Don Kuenz KB7RPU