I found fan blower noisy, and sometimes needed, and i have faced that need once again while working with a high power prototype.... the solution was the use of blowers because heatsinks not big enougth.
But listening low volume, the blower noises was there... buzzing...bothering.... even when not needed... even when i was playing 1 watt peak.... and the blower was operating with smaller voltage than it's normal rated voltage... i tried 8 volts...also have tried 6 volts...no way!
Then i decided to make something simple... using the audio output as an energy generator to drive the motor.... when our amplifier has too much power, or exagerated power...much more than we need..then we can have some of this power to be used for auxiliary circuits.
A rectifier was used... very simple and nice.... well... simple and cheap is always interesting to my eyes, heart and soul.... audio is rectified and filtered..and then i can power the fan with that energy... a resistance in series is there not to affect power amplifier performance..fourier show me that was unnafected..also AC graphics was fine too.... we have just lost 200 miliamps..when the amplifier can put out 20 to 40 amperes.... so, this is not something to worry about as waste of power.
The video show schematic, also the "thing" operating...simple..no chips..no logic circuit..not triggers, switches, delays, memories.... simple..the way it can be and the way it is working.
I have not used the voltage regulator..but for sure will operate fine...have only to use high voltage transistor and dissipation there may reach 11 watts...so a good heatsink should be used to the series pass transistor...but average power there will be very small..not too much heat there to worry about too....current is around 200 miliamperes to drive motor full speed...and average voltage will not be so big to home use...less than 400 miliwatts will be what you gonna have listening at home..even when driving hard your speakers... 11 watts may be while pumping full power... and more than 50 volts rms audio output...not very often to home use.
When low volume...low AC in the output... low rectified and filtered DC voltage will result...voltage will be smaller than zener voltage (select the zener according your needs and decisions about..your motor voltage is the reference to decide about)..so.... will feed blower with very small speed...it may be even stopped.... but this will happens when you do not need cooling..also "while you do not need, or want, noise from fan blower"... the speed will be "modulated" by the audio power...more power represents more speed and more noise...but that noise will be keep hidden by the high volume of sound....so...the circuit does the job...and it is very clever inside it's own stupidity.
Video explains (or try to) the whole thing:
YouTube - Dx variable speed blower for audio amp. cooling
Enjoy the new series of " Dx Corporation Gadgets for our enjoyment and fun"...subscrive to uncle charlie channel please:
YouTube - destroyersoueu's Channel
regards,
Carlos
But listening low volume, the blower noises was there... buzzing...bothering.... even when not needed... even when i was playing 1 watt peak.... and the blower was operating with smaller voltage than it's normal rated voltage... i tried 8 volts...also have tried 6 volts...no way!
Then i decided to make something simple... using the audio output as an energy generator to drive the motor.... when our amplifier has too much power, or exagerated power...much more than we need..then we can have some of this power to be used for auxiliary circuits.
A rectifier was used... very simple and nice.... well... simple and cheap is always interesting to my eyes, heart and soul.... audio is rectified and filtered..and then i can power the fan with that energy... a resistance in series is there not to affect power amplifier performance..fourier show me that was unnafected..also AC graphics was fine too.... we have just lost 200 miliamps..when the amplifier can put out 20 to 40 amperes.... so, this is not something to worry about as waste of power.
The video show schematic, also the "thing" operating...simple..no chips..no logic circuit..not triggers, switches, delays, memories.... simple..the way it can be and the way it is working.
I have not used the voltage regulator..but for sure will operate fine...have only to use high voltage transistor and dissipation there may reach 11 watts...so a good heatsink should be used to the series pass transistor...but average power there will be very small..not too much heat there to worry about too....current is around 200 miliamperes to drive motor full speed...and average voltage will not be so big to home use...less than 400 miliwatts will be what you gonna have listening at home..even when driving hard your speakers... 11 watts may be while pumping full power... and more than 50 volts rms audio output...not very often to home use.
When low volume...low AC in the output... low rectified and filtered DC voltage will result...voltage will be smaller than zener voltage (select the zener according your needs and decisions about..your motor voltage is the reference to decide about)..so.... will feed blower with very small speed...it may be even stopped.... but this will happens when you do not need cooling..also "while you do not need, or want, noise from fan blower"... the speed will be "modulated" by the audio power...more power represents more speed and more noise...but that noise will be keep hidden by the high volume of sound....so...the circuit does the job...and it is very clever inside it's own stupidity.
Video explains (or try to) the whole thing:
YouTube - Dx variable speed blower for audio amp. cooling
Enjoy the new series of " Dx Corporation Gadgets for our enjoyment and fun"...subscrive to uncle charlie channel please:
YouTube - destroyersoueu's Channel
regards,
Carlos
Yes...i am free to produce simple diy things..gadgets and toys
because i am not an engineer...this way i can do these things.
Enginners may need to produce sophisticated things... using microprocessors, comparators, op amps, switches and so on.... a huge circuit they can make.. but this is expensive, reason why we are not having these things, much often, in amplifiers around.
Simple solutions are funny.... i agree.... people have laughed about Darlington and others too...they laugh about Einstein too...why not to laugh about uncle charlie?.... you are welcome.
300 guys already watched the video..if 1 percent use the idea i will be already very happy.
Be confortable to laugh...but in secret you can build and use..... ahahahahaha!
regards,
Carlos😉
because i am not an engineer...this way i can do these things.
Enginners may need to produce sophisticated things... using microprocessors, comparators, op amps, switches and so on.... a huge circuit they can make.. but this is expensive, reason why we are not having these things, much often, in amplifiers around.
Simple solutions are funny.... i agree.... people have laughed about Darlington and others too...they laugh about Einstein too...why not to laugh about uncle charlie?.... you are welcome.
300 guys already watched the video..if 1 percent use the idea i will be already very happy.
Be confortable to laugh...but in secret you can build and use..... ahahahahaha!
regards,
Carlos😉
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What a brilliant idea, you should apply for a patent!
Generaly, i dont see any valuable contribution coming from
you , apart perhaps some discutable entertainment directed
sentences like this one....😀
More on topic, using the output level as signal to command
a fan is common practice, but it s way better to put a little
circuit comprising a serialy connected resistor with a diode
as rectifier , a filtering cap, and then a darlington as switch
for the fan.
Using the darlington as emitter follower, the vout max can be
settled with a zener at its base to ground while max current
can be settled with a resistor in serial with the fan or with
the darlington emitter , the latter case transfering the thermal
dissipation to the darlington rather than to the resistor.
The cap size will provide a welcomed hysteresis, i.e, if the
amp output power is brutally reduced to 0 , the fan will
very slowly reducing its speed such that the stll warmed
amp will continue to be fan cooled for a few dozen second
to two minutes , depending of the cap s value...
Attachments
Thank you dear Wahab
i am glad you like uncle charlie ideas and contribute to make them better.
I do think your contribution was nice and valuable.
regards,
Carlos
i am glad you like uncle charlie ideas and contribute to make them better.
I do think your contribution was nice and valuable.
regards,
Carlos
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An interesting idea Carlos. Not a criticism, but do you not think that the constant acceleration and deceleration of the fan with audio content may shorten its life?
Seeing as your design doesn't measure the actual heatsink temperature, the fan will need to run on somewhat longer after the dissipation peaks have passed. The amount of delay being dependent on the heatsink size and the amount of energy being dissipated and the air flow. Perhaps a variable resistor to adjust the delay time might be an idea. This would allow the design to deal with different heatsink and fan sizes.
Regards,
currentflow
Seeing as your design doesn't measure the actual heatsink temperature, the fan will need to run on somewhat longer after the dissipation peaks have passed. The amount of delay being dependent on the heatsink size and the amount of energy being dissipated and the air flow. Perhaps a variable resistor to adjust the delay time might be an idea. This would allow the design to deal with different heatsink and fan sizes.
Regards,
currentflow
Yes current...i do think this will shorten it's life...it is not a bright design
A simple idea only... as i told clearly, a gadget..something to play, to have fun, to enjoy...nothing too much serious..but cheap (now cheaper because of Wahab) and interesting.
Yes Wahab, you made much better... we can install two fasn in series because of voltage present there in the colector... higher than 12 and lower than 50.....the supply you pointed ( i will look your schematic once more ) looks to be a 50 volts supply...maybe that supply is mine rectifier and filter input section ... or maybe an auxiliary supply... can be also voltage from the power amplifier main power supply..from supply rail.... well...anyway, it is nice and very interesting to play..... i may give a try on that...nice darlington design... people laughed about Darlington...the man died poor and abandoned... he have not registered his idea.... bell laboratories (i think) had his idea for themselves.
thank you,
regards,
Carlos
A simple idea only... as i told clearly, a gadget..something to play, to have fun, to enjoy...nothing too much serious..but cheap (now cheaper because of Wahab) and interesting.
Yes Wahab, you made much better... we can install two fasn in series because of voltage present there in the colector... higher than 12 and lower than 50.....the supply you pointed ( i will look your schematic once more ) looks to be a 50 volts supply...maybe that supply is mine rectifier and filter input section ... or maybe an auxiliary supply... can be also voltage from the power amplifier main power supply..from supply rail.... well...anyway, it is nice and very interesting to play..... i may give a try on that...nice darlington design... people laughed about Darlington...the man died poor and abandoned... he have not registered his idea.... bell laboratories (i think) had his idea for themselves.
thank you,
regards,
Carlos
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Hi , Carlos
The darlington along with the emitter resistor and the zener will
act as a current generator of about 200mA , thus you can put either
one, two of even three fan in serial , provided the supply is high enough
to take account of about 36V drop voltage with three 12V 200mA fans
plus the 14V or so that will remain at the darligton collector.
The more the fans in serial, the less the darlington will dissipate.
With a single 12V/200mA fan and 50V PS , the darlington will dissipate
about 8W , while with two serial fans, this will be reduced to 5W ,
and 3W for three serialy connected fans.
so it must be mounted preferably on the main heatsink and use of
two or three fans is recommended.
With lower supply voltages, TDP will be less, of course, as well as
fan number capability , two with 35V PS.
Have FUN!
The darlington along with the emitter resistor and the zener will
act as a current generator of about 200mA , thus you can put either
one, two of even three fan in serial , provided the supply is high enough
to take account of about 36V drop voltage with three 12V 200mA fans
plus the 14V or so that will remain at the darligton collector.
The more the fans in serial, the less the darlington will dissipate.
With a single 12V/200mA fan and 50V PS , the darlington will dissipate
about 8W , while with two serial fans, this will be reduced to 5W ,
and 3W for three serialy connected fans.
so it must be mounted preferably on the main heatsink and use of
two or three fans is recommended.
With lower supply voltages, TDP will be less, of course, as well as
fan number capability , two with 35V PS.
Have FUN!
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Member
Joined 2009
Paid Member
I like this idea, definitely worth trying. I agree, simple is good and within the spirit of DIY. Now one caution, maybe best to see with experiments, but a colleague of mine threw out his home theatre amplifier because it had a fan that changed speed with power. He found he could hear the darn thing accelerate when the music got louder and although this wasn't very noticeable at first, after a longer time his brain became aware of it, and the more time passed the more his brain became irritated and in the end it was infuriating. You may have a quieter fan.
Yes, something alike that Zeon.... i had one receiver that used
the blower i am using is from that dismounted damaged Technics... it had something that put the motor to work when high power was applied to the load.
Was not very good that circuit...i remember i had to tweak that thing to work better.
I have assembled Wahab circuit.... in the first moment have not operated...but was me the one made the mistake (as usual..i am destroyer)...i had inverted transistor... a pnp in the place of a npn..circuit was operating without drive..ahahahahahaha!..then fixed.
Thanks Wahab...i am editing video and will upload it in the next hour.
regards,
Carlos
the blower i am using is from that dismounted damaged Technics... it had something that put the motor to work when high power was applied to the load.
Was not very good that circuit...i remember i had to tweak that thing to work better.
I have assembled Wahab circuit.... in the first moment have not operated...but was me the one made the mistake (as usual..i am destroyer)...i had inverted transistor... a pnp in the place of a npn..circuit was operating without drive..ahahahahahaha!..then fixed.
Thanks Wahab...i am editing video and will upload it in the next hour.
regards,
Carlos
Attachments
Or if you want to control the fan speed by the heat sink temperature you could use an MIC502 fan control chip. About $2.00 at Digikey.
http://www.micrel.com/_PDF/mic502.pdf
Using pin 5 and 6 is optional.
http://www.micrel.com/_PDF/mic502.pdf
Using pin 5 and 6 is optional.
Attachments
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Yep....some guys loves faster videos
Mine ones are very long...i agree.
regards,
Carlos
................................
Yes Wahab...i have read your text.
thanks,
Carlos
Mine ones are very long...i agree.
regards,
Carlos
................................
Yes Wahab...i have read your text.
thanks,
Carlos
Well guys... i have already had a lot of fun with this toy..now i will
search for other circuit to assemble to have more fun.
Here is the video..thank you by the audience, and attention..and subscribe to old uncle charlie not to let me alone there:
YouTube - Wahab fan blower circuit is nice!
regards,
Carlos
search for other circuit to assemble to have more fun.
Here is the video..thank you by the audience, and attention..and subscribe to old uncle charlie not to let me alone there:
YouTube - Wahab fan blower circuit is nice!
regards,
Carlos
Most sensible people use enough heatsinking.
Nobody want a fan to mix its sound into music.
If you can not have enough heatsinks
then you have too much power in your amplifier.
Such power almost noone needs to feed loudspeakers.
Regards
Nobody want a fan to mix its sound into music.
If you can not have enough heatsinks
then you have too much power in your amplifier.
Such power almost noone needs to feed loudspeakers.
Regards
Yes.... that's right.... there's a lot of non used power in some huge power amps
We know we really use few watts...so, if we have excesses, we can manage to use some for auxiliary functions...that's the idea...i think you got it.
Also not to have fan working when we do not need them...not to have noises from the fan when we listen very low volume...better to the fan to stop or to work at low speed while the amplifier is producing 1 watt each channel (the power we use to listen).
Well.... some guys wants to put sound in parties, or in social celebrations, parks, clubs, dancing clubs, and so on...these guys needs power... and these ones may feel the fan working full speed interesting.... music will be so loud that nobody will listen their fan blowing air....but even these ones, when iddle, will have not noise from the fan blowers.
Wahab circuit is nice...my style is interesting too...there are both options to our people to build if they need or want.
regards,
Carlos
We know we really use few watts...so, if we have excesses, we can manage to use some for auxiliary functions...that's the idea...i think you got it.
Also not to have fan working when we do not need them...not to have noises from the fan when we listen very low volume...better to the fan to stop or to work at low speed while the amplifier is producing 1 watt each channel (the power we use to listen).
Well.... some guys wants to put sound in parties, or in social celebrations, parks, clubs, dancing clubs, and so on...these guys needs power... and these ones may feel the fan working full speed interesting.... music will be so loud that nobody will listen their fan blowing air....but even these ones, when iddle, will have not noise from the fan blowers.
Wahab circuit is nice...my style is interesting too...there are both options to our people to build if they need or want.
regards,
Carlos
Member
Joined 2009
Paid Member
Although, the original Krell KSA-50 has a (constant speed) fan and still sounds superb from all accounts that I have read.
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