Author Topic: Wylde OD and MPSA14  (Read 923 times)

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Xavier

Wylde OD and MPSA14
« on: February 23, 2006, 10:37:37 PM »
I don't have any of these Darlingtons, so after some research I used a 2n5308, which seems to be a suitable replacement , though I had to twist the collector and base pins, according to the datasheet.

Thing is, it doesn't sound. I've used an audio probe and signal stops as soon as it hits the transistor. I even have de-twisted the pins but still nothing.

So, my problem is clear I think.........is there any other choice? can I use 2 transistors in a darlington configuration as a sub?

Marcos - Munky

Re: Wylde OD and MPSA14
« Reply #1 on: February 24, 2006, 01:41:48 AM »
Try a high gain transistor. I built mine with a BC549C and it works fine.

Xavier

Re: Wylde OD and MPSA14
« Reply #2 on: February 24, 2006, 01:58:38 AM »
I'll try then , but the gain range of the Darlingtons is way different from any FET, right? isn't that important?


MartyMart

Re: Wylde OD and MPSA14
« Reply #3 on: February 24, 2006, 02:34:35 AM »
I'll try then , but the gain range of the Darlingtons is way different from any FET, right? isn't that important?



That's right, the gain is well above 1500 hfe .. !
I used a much more common MPSA13 and it worked a treat :D

MM
"Success is the ability to go from one failure to another with no loss of enthusiasm"
My Website www.martinlister.com

tungngruv

Re: Wylde OD and MPSA14
« Reply #4 on: February 24, 2006, 05:41:06 AM »
I made one using two 2n5089 wired as a Darlington. It worked fine and sounded great.

Marcos - Munky

Re: Wylde OD and MPSA14
« Reply #5 on: February 24, 2006, 10:09:53 AM »
I believe it woudn't make a big difference, since the transistor are for a buffer. Give a try with a single high hfe transistor and with a homemade darlington.

burnt fingers

Re: Wylde OD and MPSA14
« Reply #6 on: February 24, 2006, 10:52:04 AM »
Does somebody have the schematic for this?  I would love to see it. 
 
Scott
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Marcos - Munky