Model Boat Mayhem

Technical, Techniques, Hints, and Tips => The "Black Arts!" ( Electrics & Electronics ) => Topic started by: Captain Flack on January 31, 2019, 01:14:23 PM

Title: Micro Whistle
Post by: Captain Flack on January 31, 2019, 01:14:23 PM
I have been given I believe to be an action Micro Whistle.  I have no idea how to connect this or even what voltage it works on.  Any ideas please.
Title: Re: Micro Whistle
Post by: DaveM on January 31, 2019, 01:47:47 PM
Red +ve
Black -ve
6v max.
DM
Title: Re: Micro Whistle
Post by: malcolmfrary on January 31, 2019, 06:08:23 PM
Nice drawing here - https://www.componentshop.co.uk/p29-steam-whistle-horn.html
Title: Re: Micro Whistle
Post by: DaveM on January 31, 2019, 06:58:58 PM
Thanks for the compliment, MF - but I suspect this is what the OP refers to https://www.componentshop.co.uk/micro-whistle.html (https://www.componentshop.co.uk/micro-whistle.html)
Of course I could be wrong. It wouldn't be the first time...
DM
Title: Re: Micro Whistle
Post by: Captain Flack on February 01, 2019, 09:54:46 AM
Thanks for the replies.  I had already tried the normal wiring and it didn't work so I was wondering if it needed another "gadget" to power it. It would appear to be defective.
Title: Re: Micro Whistle
Post by: DaveM on February 01, 2019, 02:49:19 PM
If it's a P29 Steam Horn/Whistle then it can be repaired - send via Component-Shop. If it's the tiny cylindrical Micro-whistle thingy then just bin it.

DM
Title: Re: Micro Whistle
Post by: Captain Flack on February 06, 2019, 01:55:05 PM
This is marked "HPE-120", and I now have two of them that don't work.  I have put 6v to them but nothing.
Title: Re: Micro Whistle
Post by: Captain Flack on February 06, 2019, 02:26:36 PM
I understand this now to be a piezo buzzer working between 3-30v.  Does anyone know if this is correct?
Title: Re: Micro Whistle
Post by: coch y bonddu on February 06, 2019, 05:30:35 PM
If it is round and black with 2 wires on it then this could well be what you got and they are only 1.50ea off Component shop


A Picture speaks a thousand words




Dave



Title: Re: Micro Whistle
Post by: C-3PO on February 06, 2019, 06:34:36 PM
A quick Google suggests a HPE-120 is just the transducer - I think it needs an external/additional circuit (driver/exciter) to make it work.

If it is then applying a voltage to it is like putting a battery across loudspeaker terminals.

If of course there is additional circuitry then ignore the above

C-3PO