| Author |
Message |
John Fields
Guest
|
 Posted:
Sat Dec 03, 2005 11:44 pm Post subject:
Re: Remote Turn-On |
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On Sat, 03 Dec 2005 16:37:24 GMT, ehsjr <ehsjr@bellatlantic.net>
wrote:
| Quote: | John Fields wrote:
On Fri, 02 Dec 2005 13:58:47 GMT, "Mike DeAngelis" <mikey4@snet.net
wrote:
The amp should turn on when an audio signal is present and turn off some
time (2 min.?) after the audio signal is not present.
---
OK. (view in Courier)
V+
+5V>-+--------+------+---------------+-----+---+ |
| | | | | | | COM
| | |R1 | | | +------+ |
| | [10k] | | | |K | O
| | | | | [4K7][DIODE] [COIL]- |
| | | | | | | | O-> |
| | | CR1 | | | +------+ |
| +---|-[1M]-+-[<1N4148]-+ |Rd | | | NO
|Rth | | | | [10K]<-|+\ | D
[10K]<-+--|+\ | R2 | | | >-+---G
| | >----+--[510K]---+---|----|-/ LM393 S
VIN>---[10K]-|-/ LM393 |+ | | U1B |
| | U1A [240µF]| | |
| | C1| | | |
GND>-+--------+------------------+---+-----+---------+
Do you need a circuit description?
C(harge)R(apidly)1 - clever! I would not have thought
of it.
|
---
Thanks! :-)
DR1? ;)
--
John Fields
Professional Circuit Designer
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Mike DeAngelis
Guest
|
| Posted:
Sun Dec 04, 2005 1:35 am Post subject:
Re: Remote Turn-On |
|
|
John,
Thanks allot. You are pretty good drawing with Courier. What would be
the device type used for driving the relay? Also, would any damage occur if
the input audio signal exceeds the rail voltage (5v)? In the application I
have in mind I believe the audio can reach 6 V RMS.
...Mike
"John Fields" <jfields@austininstruments.com> wrote in message
news:k1m3p191h52vs2c2tr6hottmiaijhrvmpe@4ax.com...
| Quote: | On Sat, 03 Dec 2005 16:37:24 GMT, ehsjr <ehsjr@bellatlantic.net
wrote:
John Fields wrote:
On Fri, 02 Dec 2005 13:58:47 GMT, "Mike DeAngelis" <mikey4@snet.net
wrote:
The amp should turn on when an audio signal is present and turn off
some
time (2 min.?) after the audio signal is not present.
---
OK. (view in Courier)
V+
+5V>-+--------+------+---------------+-----+---+ |
| | | | | | | COM
| | |R1 | | | +------+ |
| | [10k] | | | |K | O
| | | | | [4K7][DIODE] [COIL]- |
| | | | | | | | O-> |
| | | CR1 | | | +------+ |
| +---|-[1M]-+-[<1N4148]-+ |Rd | | | NO
|Rth | | | | [10K]<-|+\ | D
[10K]<-+--|+\ | R2 | | | >-+---G
| | >----+--[510K]---+---|----|-/ LM393 S
VIN>---[10K]-|-/ LM393 |+ | | U1B |
| | U1A [240µF]| | |
| | C1| | | |
GND>-+--------+------------------+---+-----+---------+
Do you need a circuit description?
C(harge)R(apidly)1 - clever! I would not have thought
of it.
---
Thanks! :-)
DR1? ;)
--
John Fields
Professional Circuit Designer |
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| Back to top |
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Fred Bloggs
Guest
|
| Posted:
Sun Dec 04, 2005 1:35 am Post subject:
Re: Remote Turn-On |
|
|
Mike DeAngelis wrote:
| Quote: | Hi,
Does anyone have a schematic, kit, or a complete product to sense a line
level audio signal and turn a remote power amplifier on? I have done all the
searches I can think of and have not found anything. These things can't be
that rare!!
Thanks...Mike DeAngelis
|
The audio line activated switch is not VOX as some have claimed- VOX is
largely a radio term and describes detecting a few tens of mV or less of
microphone output. Your circuit is working off of 100mV,RMS minimum, and
up to 2V,RMS, into 10K loading. All you need to do is gain that up,
rectify, smooth, and drive a relay. Actually, you don't need to do any
of that using a single transistor and a CMOS 555. The circuit below uses
a 2N3904 to gain up the line input to a 5Vpp swing at the 555 TRIG
input. As long as the 555 receives triggers before the 15u can
discharge, which takes about 2 mins, it will remain on keeping the relay
activated. No adjustment should be necessary.
View in a fixed-width font such as Courier.
..
..
..
.. NEUT ------------->
.. GND -+----------->
.. |
.. .-----------'
.. |
.. (-)---------+ HOT -----o---v
.. 5V | o--->
.. (+)---------|---------.
.. |100u + | |
.. +--||-----+
.. \ | | |
.. \|--+--||-----+
.. \| 0.1U | |
.. | --------
.. .-----+----+------+---------+---|/ / / / |-.
.. AUDIO | | | | | -------- |
.. LINE 0.022u | | +| | +------|<|-----+
.. IN>--+-||--. | | === [120K] | 1N4001 |
.. | | [100K] [10M] 15U | | |
.. | | | | | | TLC555------. |
.. | [10K] | | | | | VCC/RST | 2N4401 |
.. | | | | | | | | |/
.. | +-[4.7M]-+-|<|-+----+----------|THRESH OUT|-[1K]-|
.. | | |1N4148 | | | | |>
.. | | 22p | | | | | |
.. | +---||---+-----------------|---|TRIG DIS|--. |
.. | | | | | | | | |
.. | | | | | | | | |
.. | | |/ | +---|CONT | | |
.. | '------|2N3904 | | | | | |
.. | |> | | | GND | | |
.. | | | | '-----------' | |
.. [1M] | | | | | |
.. | | | [100K] | | |
.. | | | | | | |
.. | | | | | | |
.. | | | | | | |
.. '--------------+-----------------+-----------+------|-----'
.. | | |
.. --- | |
.. /// '-------------------------'
..
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Fred Bloggs
Guest
|
| Posted:
Sun Dec 04, 2005 1:35 am Post subject:
Re: Remote Turn-On |
|
|
Mike DeAngelis wrote:
| Quote: | Hi,
Does anyone have a schematic, kit, or a complete product to sense a line
level audio signal and turn a remote power amplifier on? I have done all the
searches I can think of and have not found anything. These things can't be
that rare!!
Thanks...Mike DeAngelis
|
6V RMS is not LINE level audio, but it makes no difference- just use a
reverse diode in shunt with the input transistor base:
View in a fixed-width font such as Courier.
..
..
..
.. NEUT ------------->
.. GND -+----------->
.. |
.. .-----------'
.. |
.. (-)---------+ HOT -----o---v
.. 5V | o--->
.. (+)---------|---------.
.. |100u + | |
.. +--||-----+
.. \ | | |
.. \|--+--||-----+
.. \| 0.1U | |
.. | --------
.. .-----+----+------+---------+---|/ / / / |-.
.. AUDIO | | | | | -------- |
.. LINE 0.022u | | +| | +------|<|-----+
.. IN>--+-||--. | | === [120K] | 1N4001 |
.. | | [100K] [10M] 15U | | |
.. | | | | | | TLC555------. |
.. | [10K] | | | | | VCC/RST | 2N4401 |
.. | | | | | | | | |/
.. | +-[4.7M]-+-|<|-+----+----------|THRESH OUT|-[1K]-|
.. | | |1N4148 | | | | |>
.. | | 22p | | | | | |
.. | +---||---+-----------------|---|TRIG DIS|--. |
.. | | | | | | | | |
.. | | | | | | | | |
.. | | |/ | +---|CONT | | |
.. | +------|2N3904 | | | | | |
.. | | |> | | | GND | | |
.. | | | | | '-----------' | |
.. [1M] | 1N4148 | | | | | |
.. | '--|<|---+ | [100K] | | |
.. | | | | | | |
.. | | | | | | |
.. | | | | | | |
.. '--------------+-----------------+-----------+------|-----'
.. | | |
.. --- | |
.. /// '-------------------------'
.. |
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| Back to top |
|
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Mike DeAngelis
Guest
|
| Posted:
Sun Dec 04, 2005 5:35 pm Post subject:
Re: Remote Turn-On |
|
|
Sorry, I should have said 6 v p-p. That is the stated output of a networked
music player that will be driving this amplifier.
...Mike
"Fred Bloggs" <nospam@nospam.com> wrote in message
news:43922BDC.7020404@nospam.com...
| Quote: |
Mike DeAngelis wrote:
Hi,
Does anyone have a schematic, kit, or a complete product to sense a
line
level audio signal and turn a remote power amplifier on? I have done all
the
searches I can think of and have not found anything. These things can't
be
that rare!!
Thanks...Mike DeAngelis
6V RMS is not LINE level audio, but it makes no difference- just use a
reverse diode in shunt with the input transistor base:
View in a fixed-width font such as Courier.
.
.
.
. NEUT -------------
. GND -+-----------
. |
. .-----------'
. |
. (-)---------+ HOT -----o---v
. 5V | o---
. (+)---------|---------.
. |100u + | |
. +--||-----+
. \ | | |
. \|--+--||-----+
. \| 0.1U | |
. | --------
. .-----+----+------+---------+---|/ / / / |-.
. AUDIO | | | | | -------- |
. LINE 0.022u | | +| | +------|<|-----+
. IN>--+-||--. | | === [120K] | 1N4001 |
. | | [100K] [10M] 15U | | |
. | | | | | | TLC555------. |
. | [10K] | | | | | VCC/RST | 2N4401 |
. | | | | | | | | |/
. | +-[4.7M]-+-|<|-+----+----------|THRESH OUT|-[1K]-|
. | | |1N4148 | | | | |
. | | 22p | | | | | |
. | +---||---+-----------------|---|TRIG DIS|--. |
. | | | | | | | | |
. | | | | | | | | |
. | | |/ | +---|CONT | | |
. | +------|2N3904 | | | | | |
. | | |> | | | GND | | |
. | | | | | '-----------' | |
. [1M] | 1N4148 | | | | | |
. | '--|<|---+ | [100K] | | |
. | | | | | | |
. | | | | | | |
. | | | | | | |
. '--------------+-----------------+-----------+------|-----'
. | | |
. --- | |
. /// '-------------------------'
.
|
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| Back to top |
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Fred Bloggs
Guest
|
| Posted:
Sun Dec 04, 2005 5:35 pm Post subject:
Re: Remote Turn-On |
|
|
Okay- well that's more like it- 3*0.7=2VRMS which is a standard.
Mike DeAngelis wrote:
| Quote: | Sorry, I should have said 6 v p-p. That is the stated output of a networked
music player that will be driving this amplifier.
...Mike
"Fred Bloggs" <nospam@nospam.com> wrote in message
news:43922BDC.7020404@nospam.com...
Mike DeAngelis wrote:
Hi,
Does anyone have a schematic, kit, or a complete product to sense a
line
level audio signal and turn a remote power amplifier on? I have done all
the
searches I can think of and have not found anything. These things can't
be
that rare!!
Thanks...Mike DeAngelis
6V RMS is not LINE level audio, but it makes no difference- just use a
reverse diode in shunt with the input transistor base:
View in a fixed-width font such as Courier.
.
.
.
. NEUT -------------
. GND -+-----------
. |
. .-----------'
. |
. (-)---------+ HOT -----o---v
. 5V | o---
. (+)---------|---------.
. |100u + | |
. +--||-----+
. \ | | |
. \|--+--||-----+
. \| 0.1U | |
. | --------
. .-----+----+------+---------+---|/ / / / |-.
. AUDIO | | | | | -------- |
. LINE 0.022u | | +| | +------|<|-----+
. IN>--+-||--. | | === [120K] | 1N4001 |
. | | [100K] [10M] 15U | | |
. | | | | | | TLC555------. |
. | [10K] | | | | | VCC/RST | 2N4401 |
. | | | | | | | | |/
. | +-[4.7M]-+-|<|-+----+----------|THRESH OUT|-[1K]-|
. | | |1N4148 | | | | |
. | | 22p | | | | | |
. | +---||---+-----------------|---|TRIG DIS|--. |
. | | | | | | | | |
. | | | | | | | | |
. | | |/ | +---|CONT | | |
. | +------|2N3904 | | | | | |
. | | |> | | | GND | | |
. | | | | | '-----------' | |
. [1M] | 1N4148 | | | | | |
. | '--|<|---+ | [100K] | | |
. | | | | | | |
. | | | | | | |
. | | | | | | |
. '--------------+-----------------+-----------+------|-----'
. | | |
. --- | |
. /// '-------------------------'
.
|
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John Fields
Guest
|
| Posted:
Mon Dec 05, 2005 12:22 am Post subject:
Re: Remote Turn-On |
|
|
On Sat, 03 Dec 2005 21:23:59 GMT, "Mike DeAngelis" <mikey4@snet.net>
wrote:
| Quote: | John,
Thanks allot. You are pretty good drawing with Courier. What would be
the device type used for driving the relay?
|
---
2N7000 or any logic-level MOSFET capable of driving the coil of the
relay.
---
| Quote: | Also, would any damage occur if
the input audio signal exceeds the rail voltage (5v)? In the application I
have in mind I believe the audio can reach 6 V RMS.
|
---
From your post after this one it's 6VPP, and the input comparator
won't like that much, so you can fix it like this:
V+
+5V>-+-----------+---+---------------+-----+---+ |
| | |R1 | | | | COM
| | 10K] | | | +------+ |
| | | CR1 | | | |K | O
| | +-[<1N4148]-+ | | [4K7][DIODE] [COIL]- |
[10k] | | | | | | | | O-> |
| | | [200] | | | +------+ |
| | | | |Rd | | | NO
| | | | [10K]<-|+\ | D
+----------|+\ | R2 | | | >-+---G NCH
| | >-+--[2.2M]---+---|----|-/ LM393 S
VIN>---[10K]-+--|-/ LM393 |+ | | U1B |
| | | U1A [51µF]| | |
[200] [1N4148]| C1| | | |
| |A | | | | |
GND>-+-------+---+---------------+---+-----+---------+
Also, I've set the input threshold to switch at 0.1V, so that
eliminates one pot. You need the other one (Rd) to adjust your
amplifier turn-off delay time because of the tolerance and leakage
current of C1. Also, I've decreased the value of C1 to 51µF in
order to decrease its potential leakage current.
--
John Fields
Professional Circuit Designer |
|
| Back to top |
|
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Mike DeAngelis
Guest
|
| Posted:
Mon Dec 05, 2005 1:35 am Post subject:
Re: Remote Turn-On |
|
|
Gentlemen:
Thanks for all the input. I'll test these circuits in the next couple of
weeks and see how they work.
.....Mike
"John Fields" <jfields@austininstruments.com> wrote in message
news:jhb6p1t99rb89jvoh3dtnjvdug5bg63c05@4ax.com...
| Quote: | On Sat, 03 Dec 2005 21:23:59 GMT, "Mike DeAngelis" <mikey4@snet.net
wrote:
John,
Thanks allot. You are pretty good drawing with Courier. What would be
the device type used for driving the relay?
---
2N7000 or any logic-level MOSFET capable of driving the coil of the
relay.
---
Also, would any damage occur if
the input audio signal exceeds the rail voltage (5v)? In the application
I
have in mind I believe the audio can reach 6 V RMS.
---
From your post after this one it's 6VPP, and the input comparator
won't like that much, so you can fix it like this:
V+
+5V>-+-----------+---+---------------+-----+---+ |
| | |R1 | | | | COM
| | 10K] | | | +------+ |
| | | CR1 | | | |K | O
| | +-[<1N4148]-+ | | [4K7][DIODE] [COIL]- |
[10k] | | | | | | | | O-> |
| | | [200] | | | +------+ |
| | | | |Rd | | | NO
| | | | [10K]<-|+\ | D
+----------|+\ | R2 | | | >-+---G NCH
| | >-+--[2.2M]---+---|----|-/ LM393 S
VIN>---[10K]-+--|-/ LM393 |+ | | U1B |
| | | U1A [51µF]| | |
[200] [1N4148]| C1| | | |
| |A | | | | |
GND>-+-------+---+---------------+---+-----+---------+
Also, I've set the input threshold to switch at 0.1V, so that
eliminates one pot. You need the other one (Rd) to adjust your
amplifier turn-off delay time because of the tolerance and leakage
current of C1. Also, I've decreased the value of C1 to 51µF in
order to decrease its potential leakage current.
--
John Fields
Professional Circuit Designer |
|
|
| Back to top |
|
|
Michael A. Terrell
Guest
|
| Posted:
Mon Dec 05, 2005 5:35 pm Post subject:
Re: Remote Turn-On |
|
|
Fred Bloggs wrote:
| Quote: |
The audio line activated switch is not VOX as some have claimed- VOX is
largely a radio term and describes detecting a few tens of mV or less of
microphone output. Your circuit is working off of 100mV,RMS minimum, and
up to 2V,RMS, into 10K loading.
|
Fred, some PA systems also use VOX to reduce background noise by
shorting the output of the microphone preamp when there is nothing but
background noise. Some have a single channel and are used in background
music systems while others are multiple channel for live events.
--
?
Michael A. Terrell
Central Florida |
|
| Back to top |
|
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Kevin G. Rhoads
Guest
|
| Posted:
Mon Dec 05, 2005 11:39 pm Post subject:
Re: Remote Turn-On |
|
|
| Quote: | C(harge)R(apidly)1 - clever! I would not have thought of it.
|
More likely the thought was C(rystal)R(ectifier)1 -- ask any of the older regulars, I only go back to
slide rules, I never had to probe galena with cat's whiskers to make my own crystal rectifiers.
(the essence of humor is supposed to be playing it straight, is that why everyone is laughing at me?) |
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ehsjr
Guest
|
| Posted:
Thu Dec 08, 2005 12:23 am Post subject:
Re: Remote Turn-On |
|
|
Kevin G. Rhoads wrote:
| Quote: | C(harge)R(apidly)1 - clever! I would not have thought of it.
More likely the thought was C(rystal)R(ectifier)1 -- ask any of the older regulars, I only go back to
slide rules, I never had to probe galena with cat's whiskers to make my own crystal rectifiers.
(the essence of humor is supposed to be playing it straight, is that why everyone is laughing at me?)
|
Yeahbut - he came back with DR1, which must be for a self healing
circuit. :-)
Ed |
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