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PICList Thread
'[OT] Audio amp'
2000\03\22@080709 by Jinx

face picon face
Hi, any suggestions for a low power audio amp for a battery
operated unit. 1 or 2W, 5 to 6.5V. Discrete or IC, desirably well
below 1mA quiescent or, better, one that can be powered down
when not needed

2000\03\22@091952 by Andrew Kelley

picon face
An LM386 with caps and a 2n2222 will work.
Use the 2n222 as a switch and lm386 as an amp.

Andrew
PS: That's what I use in my lightwave transciever.
ARS: N1YEW

On Thu, 23 Mar 2000 01:02:57 +1200 Jinx <spam_OUTjoecolquittTakeThisOuTspamCLEAR.NET.NZ>
writes:
> Hi, any suggestions for a low power audio amp for a battery
> operated unit. 1 or 2W, 5 to 6.5V. Discrete or IC, desirably well
> below 1mA quiescent or, better, one that can be powered down
> when not needed

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2000\03\22@092159 by Max Toole

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In a message dated 3/22/00 8:07:10 AM Eastern Standard Time,
.....joecolquittKILLspamspam@spam@CLEAR.NET.NZ writes:

> Hi, any suggestions for a low power audio amp for a battery
>  operated unit. 1 or 2W, 5 to 6.5V. Discrete or IC, desirably well
>  below 1mA quiescent or, better, one that can be powered down
>  when not needed
Take a look at the National Semi "Boomer" line.  I use the LM4862N.  It is
only 350 mw but they have several power ratings.  Great little amp.

Max

2000\03\22@093239 by artky1k

flavicon
face
> PS: That's what I use in my lightwave transciever.
> ARS: N1YEW


Andrew, are you active on laser (free space open air lasercom)?

If you have an interest in this, please be aware that there is a
mailing list dedicated to this topic and that there are others in your
area that are looking for QSO partners.

Drop me a line if I can help you further. Also, advise if you are
aware of any lasercom persons in Maine or NH-Im in Maine
(fn54hm).

Regards,

Art

2000\03\22@111155 by Michael Rigby-Jones

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face
part 0 3971 bytes
<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">The LM386 is only around 1/4 watt o/p though isn't it?</FONT>
</P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">There probably are ultra low quiescent devices around, used in walkmans and the like, but I don't have any part no.s of the top of my head.&nbsp; What kind of quality do you need?&nbsp; If you aren't shooting for hi-fi, then you could roll your own by using a low power op-amp followed by a push-pull emitter follower stage.&nbsp; If you don't bias the output stage but rely on feedback to minimise crossover distortion then quiescent will be pretty tiny.</FONT></P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Cheers</FONT>
</P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Mike</FONT>
</P>
<UL>
<P><FONT SIZE=1 FACE="Arial">{Original Message removed}

2000\03\22@132823 by William Chops Westfield

face picon face
   any suggestions for a low power audio amp for a battery
   operated unit. 1 or 2W, 5 to 6.5V.

Keep in mind your power equation : P = V*V/R

To get even one Watt from a 5V power supply and a typical 8 ohm speaker will
require one of the fancy new complementary-driven amps.  Something like the
national LM4860 looks about like what you're looking for, but this seems to
be a big market segment these days, and there would appear to be a lot of
similar products...

BillW

2000\03\22@162625 by Brent Brown

picon face
Philips make some nice little 8 pin chips that do something like
this. Check out the TDA7052 for 1.2W mono, no shutdown pin but
Iq about 4mA. They probably have something newer and better out
now. Are you using a micro to produce the audio? - put some
MOSFETs on it and make your own grunty little switching amplifier.

Jinx wrote:
> Hi, any suggestions for a low power audio amp for a battery
> operated unit. 1 or 2W, 5 to 6.5V. Discrete or IC, desirably well
> below 1mA quiescent or, better, one that can be powered down
> when not needed


Brent Brown
Electronic Design Solutions
16 English Street
Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile: 025 334 069
eMail:  brent.brownspamKILLspamclear.net.nz

2000\03\22@171657 by briang

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face
In-Reply-To: <008701bf93ff$a435dc40$423561cb@joec>

I remember an little audio amplifier in an 8 pin DIL that was very easy
to use: It was the ULN3718. Much simpler to use than the LM386.
Unfortunately I don't remember who made them or anything.

Brian Gregory.
.....briangKILLspamspam.....cix.co.uk

2000\03\23@041030 by Jinx

face picon face
This looks the business. Minimal external components, 0.7uA shutdown,
675mW @ 1% THD into 8 ohms, 2.7 - 5.5V. Be definitely looking for these.
Perfect complement for PIC / ISD sound system.

Thanx

> > Hi, any suggestions for a low power audio amp for a battery
> >  operated unit. 1 or 2W, 5 to 6.5V. Discrete or IC, desirably well
> >  below 1mA quiescent or, better, one that can be powered down
> >  when not needed

From: Max Toole <EraseMEMaxToolespam_OUTspamTakeThisOuTAOL.COM>

> Take a look at the National Semi "Boomer" line.  I use the LM4862N.  It is
> only 350 mw but they have several power ratings.  Great little amp.
>
> Max

2000\03\23@041647 by EMFLD, SCADA (Ed/Sandy)

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face
part 0 3259 bytes
<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Hello - </FONT>
</P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Regarding &quot;perfect compliment for PIC/ISD sound system&quot;.&nbsp; I am trying to get a PIC 16c84 to control and ISD 4003 and I'm not having much luck.&nbsp; Have you done this.&nbsp; Can you provide any code/ schematics.</FONT></P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Thanks</FONT>
</P>
<UL>
<P><FONT SIZE=1 FACE="Arial">{Original Message removed}

2000\03\23@114144 by Lea

picon face
Hi jinx.

I use the LM388 (far better than LM386, more stable and do not
oscilate all time), 5-9 V operation, 1.5 W @ 9V, very good audio
quality and few external components, standby current, don't know
but seems to be very low.

see you.
  Leandro J. Laporta (LU2AOQ)
  mail: lu2aoqspamspam_OUTyahoo.com
  wrk: Arg. Assoc. for Space Technology.
  ham: TCP/IP high speed group HSG


__________________________________________________
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2000\03\23@134222 by jb

flavicon
face
This is crude, but it works good for a quick hack. I had two buttons, one
for for record, one for play. I didn't get so far as to do any real
addressing for multiple messages, etc., but this should get you started.
The connections should be obvious from the code defs. 4MHz crystal, both
chips at 3VDC as I recall.

JB

               ERRORLEVEL      -302
               Processor       16F84
               Radix           HEX
;               EXPAND
               include <p16f84.inc>
               __config  _XT_OSC & _WDT_OFF & _PWRTE_ON

       cblock          0x00c
       w_tmp,w_1,Char,L1,L2,IdxL,IdxH,Bitcnt
       endc

;PORTA defs:
SCLK    EQU     H'00'
SS      EQU     H'01'
MOSI    EQU     H'02'
MISO    EQU     H'03'
INT     EQU     H'04'

;PORTB defs:
PlayK   EQU     H'00'
RecordK EQU     H'01'

;Control defs (IdxH):
Run     EQU     H'07'
Play    EQU     H'06'
PowerUp EQU     H'05'
Ignore  EQU     H'04'
MC      EQU     H'03'


       org     H'00'
       goto            Start

       org             H'04'

Interrupt:
       retfie

Start:

       movlw           B'00011000'
       tris            PORTA
       movlw           B'00000011'     ;rb7=input value
       tris            PORTB
       clrf            PORTB
       call            SendPowerUp
       call            Delay100mS
Main:
       call            PollInt
       call            PollPlay
       call            PollRecord

       goto            Main

;***********************************
;begin subs
;***********************************

PollInt:
       return

PollPlay:
       btfsc           PORTB,PlayK
       return
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       btfsc           PORTB,PlayK
       return
       call            SendPlay
PlayRelease:
       btfss           PORTB,PlayK
       goto            PlayRelease
       call            SendStop
       return

PollRecord:
       btfsc           PORTB,RecordK
       return
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       call            Delay1mS
       btfsc           PORTB,RecordK
       return
       call            SendRecord
RecRelease:
       btfss           PORTB,RecordK
       goto            RecRelease
       call            SendStop
       return

SendPowerUp:
       clrf            IdxL
       clrf            IdxH
       bsf             IdxH,PowerUp
       bsf             IdxH,Ignore
       call            SendWord
       return

SendStop:
       clrf            IdxL
       clrf            IdxH
       bsf             IdxH,PowerUp
       bsf             IdxH,Ignore

       call            SendWord
       return

SendPlay:
       clrf            IdxL
       clrf            IdxH
       bsf             IdxH,PowerUp
       bsf             IdxH,Play
       bsf             IdxH,Run
       call            SendWord
       return

SendRecord:
       clrf            IdxL
       clrf            IdxH
       bsf             IdxH,PowerUp
       bsf             IdxH,Run
       call            SendWord
       return

SendWord:
       movlw           d'16'
       movwf           Bitcnt
       bcf             PORTA,SCLK      ;clock starts low
       bcf             PORTA,SS        ;begin xfer
sendbit:
       btfss           IdxL,0
       goto            outlow
outhigh:
       bsf             PORTA,MOSI
       goto            clockhigh
outlow:
       bcf             PORTA,MOSI
clockhigh:
       nop
       nop
       bsf             PORTA,SCLK      ;clock in this bit
       nop
       nop
getbit:
       btfss           PORTA,MISO      ;rotate in bit
       goto            inlow
inhigh:
       rrf             IdxH,f
       rrf             IdxL,f
       bsf             IdxH,7
       goto            cont1
inlow:
       rrf             IdxH,f
       rrf             IdxL,f
       bcf             IdxH,7
cont1:
       nop
       nop
       bcf             PORTA,SCLK
       decfsz          Bitcnt,f
       goto            sendbit
       bsf             PORTA,SS        ;16 bits shifted, command complete
       return

Delay1mS:                       ;
       movwf           w_1     ;
       movlw           D'17'   ; 945 cycles incl pro/epilog
       movwf           L1      ;
bdL1:
       movwf           L2      ;
bdL2:
       decfsz          L2,f    ;
       goto            bdL2    ;
       decfsz          L1,f    ;
       goto            bdL1    ;

       movlw           D'18'   ;add 55 cycles
       movwf           L1      ;
bdL3:
       decfsz          L1,f    ;3 per round, 4 on last round
       goto            bdL3

       movf            w_1,W   ;
       return                  ;

Delay100mS:                     ;
       movwf           w_1     ;
       movlw           D'40'   ;
       movwf           L1      ;
bdL1a:
       movwf           L2      ;
bdL2a:
       decfsz          L2,f    ;
       goto            bdL2a   ;
       decfsz          L1,f    ;
       goto            bdL1a   ;

       movlw           D'18'   ;add 55 cycles
       movwf           L1      ;
bdL3a:
       decfsz          L1,f    ;3 per round, 4 on last round
       goto            bdL3a

       movf            w_1,W   ;
       return                  ;

       end

{Original Message removed}

2000\03\23@190229 by Jinx

face picon face
> Behalf Of YEMFLD, SCADA (Ed/Sandy)
>
> Hello -
> Regarding "perfect compliment for PIC/ISD sound system".  I am trying to
> get a PIC 16c84 to control and ISD 4003 and I'm not having much luck.
> Have you done this.  Can you provide any code/ schematics.
> Thanks

I'm using a 1416 in a very simple configuration, haven't yet looked into
the various s/w-controlled playback modes, and I'm not familiar with the
4003.  http://www.isd.com has a lot of info, maybe you'll find something there
if the list can't help you specifically.

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