High pitch noise coming from tank?
High pitch noise coming from tank?
This didnt really concern me when i first started using my tamiya pershing but im just wondering is it normal to have a high pitch noise when you turn on your tank? it still has the noise when you turn the speaker to zero.
Re: High pitch noise coming from tank?
Hi Victor,
Exactly what sort of noise is it? Is it a high pitched whine that appears when the tank is turned on then rises in pitch till it can no longer be heard? Like a camera flashgun?
If so it is probably the gun flash module starting to charge up. These work in just the same way as a camera flashgun and it does not indicate there is a fault somewhere if this is the cause.
Another possibility is the speed controller circuitry within the DMD unit. These contain a high frequency oscillator which switches the motors on and off very rapidly to give the speed control. The current supply to the motors is controlled by the length of time of the "on" pulses - the longer these "on" pulses are, the more power is allowed through to the motors so the faster the tank will go. If this is the cause you might notice a change in volume of the whistle as you start to move the stick on the controller. Also try adjusting the trim on the turret rotation stick. There is also a speed controller here and that might be causing it.
Try adjusting the trim setting on the throttle stick. Does the whine disappear? Try disconnecting the motors. Does it disappear now?
Try disconnecting the speaker. Do you still have the whine? If you do it is probably coming from one or both the motors Some can "sing" when they get a small amount of juice fed to them. Adjusting the trim with the speaker disconnected should cure it.
One thing you could try is borrowing a DMD and MFU from somebody. It does not have to be a Pershing - any Tam tank will do except possibly the Leo. Try substituting the two units one at a time and see if the whine goes away.
Another thing you can try is to re-route some of your wiring (not that easy in a Pershing). sometimes if wiring is bunched together pulses can travel from one wire to another by induction, though I think Tams are pretty resistant to this.
It is difficult to identify the source of unwanted noises without actually driving and listening to the tank. If you could get it to a meeting it is probable that another member might be able to help you find the cause fairly quickly, but at a distance and without hearing it, diagnosis can be very difficult.
I have a very similar problem on my 1/8 Panther, but it is not very loud so I just keep the volume up high enough to hide it!!!!
Anybody else got any ideas on this?
Peter
Exactly what sort of noise is it? Is it a high pitched whine that appears when the tank is turned on then rises in pitch till it can no longer be heard? Like a camera flashgun?
If so it is probably the gun flash module starting to charge up. These work in just the same way as a camera flashgun and it does not indicate there is a fault somewhere if this is the cause.
Another possibility is the speed controller circuitry within the DMD unit. These contain a high frequency oscillator which switches the motors on and off very rapidly to give the speed control. The current supply to the motors is controlled by the length of time of the "on" pulses - the longer these "on" pulses are, the more power is allowed through to the motors so the faster the tank will go. If this is the cause you might notice a change in volume of the whistle as you start to move the stick on the controller. Also try adjusting the trim on the turret rotation stick. There is also a speed controller here and that might be causing it.
Try adjusting the trim setting on the throttle stick. Does the whine disappear? Try disconnecting the motors. Does it disappear now?
Try disconnecting the speaker. Do you still have the whine? If you do it is probably coming from one or both the motors Some can "sing" when they get a small amount of juice fed to them. Adjusting the trim with the speaker disconnected should cure it.
One thing you could try is borrowing a DMD and MFU from somebody. It does not have to be a Pershing - any Tam tank will do except possibly the Leo. Try substituting the two units one at a time and see if the whine goes away.
Another thing you can try is to re-route some of your wiring (not that easy in a Pershing). sometimes if wiring is bunched together pulses can travel from one wire to another by induction, though I think Tams are pretty resistant to this.
It is difficult to identify the source of unwanted noises without actually driving and listening to the tank. If you could get it to a meeting it is probable that another member might be able to help you find the cause fairly quickly, but at a distance and without hearing it, diagnosis can be very difficult.
I have a very similar problem on my 1/8 Panther, but it is not very loud so I just keep the volume up high enough to hide it!!!!
Anybody else got any ideas on this?
Peter
Re: High pitch noise coming from tank?
Yes it rises from when you switch it on but it can still be heard, dunno if this is normal though.BigPanzer wrote:Hi Victor,
Is it a high pitched whine that appears when the tank is turned on then rises in pitch till it can no longer be heard? Like a camera flashgun?
Re: High pitch noise coming from tank?
Hi,
Try turning the tank on with the speaker disconnected. Is it still there? If it is, then try firing the gun. Ensure that the unit flashes. If it does, does this make any difference to the level or pitch of the noise? Try disconnecting the gunflash module at the MFU unit and turn the tank on. Do you still get it?
Be careful here. Leave the tank switched off for a few minutes before you do it.
There is a very high voltage present here which gradually discharges after turn off. Believe me, if you get caught it will hurt!
(It is beginning to sound like it is being generated by the gunflash module. It can be made audible in 2 ways - either the module itself is singing and the noise is making its presence known mechanically OR it is being induced into the audio circuits electrically after the volume control. The volume control is in the early stages of the amplifier. I think the former is more likely)
As to whether it is normal or not, I have never come across this problem in a Tam, but I am old and my hearing is not good!
Let me know what your findings are and if you want to take the diagnosis further you will need some equipment - a foot or so of hosepipe.
Peter
PS PLEASE can somebody with more experience of Tams than me stick their head up and let us know if this can be a problem with the Pershing.
Try turning the tank on with the speaker disconnected. Is it still there? If it is, then try firing the gun. Ensure that the unit flashes. If it does, does this make any difference to the level or pitch of the noise? Try disconnecting the gunflash module at the MFU unit and turn the tank on. Do you still get it?
Be careful here. Leave the tank switched off for a few minutes before you do it.
There is a very high voltage present here which gradually discharges after turn off. Believe me, if you get caught it will hurt!
(It is beginning to sound like it is being generated by the gunflash module. It can be made audible in 2 ways - either the module itself is singing and the noise is making its presence known mechanically OR it is being induced into the audio circuits electrically after the volume control. The volume control is in the early stages of the amplifier. I think the former is more likely)
As to whether it is normal or not, I have never come across this problem in a Tam, but I am old and my hearing is not good!
Let me know what your findings are and if you want to take the diagnosis further you will need some equipment - a foot or so of hosepipe.
Peter
PS PLEASE can somebody with more experience of Tams than me stick their head up and let us know if this can be a problem with the Pershing.
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Re: High pitch noise coming from tank?
Whining
Not got a Pershing, but got lots of Tigers and King Tigers
I get a whining sounds
From the Tamiya tank if the throttle is not quiet in neutral position. Try just moving the throttle stick just a fraction forwards /backwards side to side. Also sometimes caused if the trim tabs are not centralized on the throttle.
You also get a higher pitched noise which is barely audible after you fire the main gun.
Whereabouts are you in Derbyshire?
I am Notts Derbys Borders
Not got a Pershing, but got lots of Tigers and King Tigers
I get a whining sounds
From the Tamiya tank if the throttle is not quiet in neutral position. Try just moving the throttle stick just a fraction forwards /backwards side to side. Also sometimes caused if the trim tabs are not centralized on the throttle.
You also get a higher pitched noise which is barely audible after you fire the main gun.
Whereabouts are you in Derbyshire?
I am Notts Derbys Borders
Re: High pitch noise coming from tank?
Thanks for the input. I can't hear the whine at all from either of my current Tam setups due to my old hearing so I was trying to help with possible fault diagnosis.
Hope this helps you Victor.
Peter
Hope this helps you Victor.
Peter
