Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: PancakeGiraffe on November 12, 2017, 01:48:36 PM

Title: Blown output capacitors?
Post by: PancakeGiraffe on November 12, 2017, 01:48:36 PM

Hi there!

I completed the Crack around a week ago. While I was doing the voltage checks, I must've shorted something and a bright spark erupted somewhere around the blue capacitors. I cautiously redid the voltage checks, and everything checked out, so I proceeded to use the Crack. No problems!

However, due to the sheer paranoia, I decided to recheck the output capacitors today. My DMM can't measure capacitance, so I discharged the capacitors with a screwdriver, and measured the resistance across the leads. It should go from 0 to infinity, right? Both of the blue ones stop at around 3 KΩ. The brown ones hit infinity.

Is this something to worry about? Should I replace them? Just wanna be sure before I install the Speedball upgrade.

Thanks bunches!

Title: Re: Blown output capacitors?
Post by: Paul Birkeland on November 12, 2017, 02:42:42 PM

Those capacitors discharge through the 2.49K resistors and/or the shorting headphone jack (with the Crack 1.1).

You are seeing 3K across each cap because there is a 3K/10W resistor in each channel between ground and the positive side of each capacitor.

Title: Re: Blown output capacitors?
Post by: PancakeGiraffe on November 12, 2017, 03:14:19 PM

Thanks for the quick reply and putting me at ease, PB! Greatly appreciated! :D