English Amiga Board


Go Back   English Amiga Board > Support > support.Hardware > Hardware mods

 
 
Thread Tools
Old 08 July 2017, 14:45   #1
Glen M
Registered User

 
Join Date: May 2017
Location: Belfast
Posts: 451
Problems adding buzzer to gotek

I stumbled across a thread that shows a buzzer added to a gotek drive so I decided to try it myself. The picture on the thread shows it assembled as follows.

http://kipper2k.com/amiga/gotek/gotek.jpg

I've assembled mine the same but the buzzer sounds constantly. Any ideas what I've missed?

I've used a 5v buzzer, 1k resistor and bc547 transistor as per the instructions.
Glen M is offline  
Old 08 July 2017, 17:49   #2
Akira
Registered User

Akira's Avatar
 
Join Date: May 2001
Location: New York
Posts: 19,265
Can you post a pic of what you have done?
Akira is offline  
Old 10 July 2017, 10:04   #3
Glen M
Registered User

 
Join Date: May 2017
Location: Belfast
Posts: 451
Sorry for the delay in posting, imgur was being strange.

Anyway, here is a picture of what I have done. The keen eyed will notice the resistor is actually 1.1k but it was all I had. I later swapped it out for 3x330 in series so 990ohm but this to made no difference, the buzzer just sounds constantly. I'll call to the electronics shop later and get a few 1k resistors but I doubt it'll make any difference.

http://imgur.com/geEI8BQ
Glen M is offline  
Old 10 July 2017, 11:07   #4
Allen1
Registered User
 
Join Date: Nov 2009
Location: Blyth England
Age: 63
Posts: 786
The problem could be that the transistor is damaged ie static or possibly heated for too long especially the lead with the black wire on it. If you have another transistor then try that, the resistors were/are close enough in value so it should have worked.
Allen1 is offline  
Old 10 July 2017, 12:13   #5
Daedalus
Registered User

Daedalus's Avatar
 
Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 4,208
Yep, the problem isn't the resistor, for a transistor switching circuit, almost any value would work (within reason...) - though I'd have gone closer to 10K myself. Can you measure the voltage at each side of that resistor while it's running and tell us what you get?

Also, have you checked the transistor part number? Just in case you have the transistor's complement, the BC557, which would cause some funky behaviour.
Daedalus is offline  
Old 10 July 2017, 14:47   #6
Glen M
Registered User

 
Join Date: May 2017
Location: Belfast
Posts: 451
I tried 2 different transistors, only touched the solder for a second so I doubt heat damaged them both. The part number on the transistor is BC547B NPN transistor.

I'll look at measurements tonight if I get the chance. Will need the ear defenders out though as the buzzer is bloody loud, either that or a bit of tape over it will do!
Glen M is offline  
Old 10 July 2017, 15:25   #7
robinsonb5
Registered User
 
Join Date: Mar 2012
Location: Norfolk, UK
Posts: 615
I'm not 100% sure but I think your problem here is that you're using a buzzer that has internal driver circuitry, rather than just a transducer.
Kipper used this part: https://www.digikey.co.uk/products/e...ds=668-1373-nd which doesn't have an internal driver, so it will only click when the level of the step signal changes.

The /STEP signal is active low, which means the transistor will be passing current while the disk drive is idle, which is why your buzzer is sounding constantly. You could add a second transistor to invert the /STEP signal, or just replace the buzzer with a driverless one.
robinsonb5 is offline  
Old 10 July 2017, 15:38   #8
Daedalus
Registered User

Daedalus's Avatar
 
Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 4,208
Ah, of course! That's probably it alright! Good call robinsonb5 - I never really thought about what the buzzer was actually doing.
Daedalus is offline  
Old 10 July 2017, 16:17   #9
supaduper
Registered User
supaduper's Avatar
 
Join Date: Oct 2012
Location: Birmingham UK
Posts: 877
Yes I`d agree most defo the buzzer
try these they work well
http://www.ebay.co.uk/itm/KINGSTATE-...item27f6a6f8b1
supaduper is offline  
Old 10 July 2017, 17:13   #10
Glen M
Registered User

 
Join Date: May 2017
Location: Belfast
Posts: 451
Cheers guys. I thought a buzzer is just a buzzer but apparently not. I've ordered up that one in the link so hopefully that resolves the issue.
Glen M is offline  
Old 10 July 2017, 17:43   #11
liviux76
Registered User

liviux76's Avatar
 
Join Date: Jan 2014
Location: BO/Italy
Posts: 711
Years ago I bought a few buzzer kits for my goteks from supaduper (really a great guy!) and they always worked perfectly! You will certainly solve your issue!
liviux76 is offline  
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gotek Problems d0ORk Hardware mods 14 03 January 2017 18:15
Gotek problems.... SYSTEMX Hardware mods 8 16 January 2016 23:51
Problems with two games on Gotek MRTomppa support.Games 12 05 September 2015 16:57

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +2. The time now is 09:00.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Page generated in 0.07387 seconds with 15 queries