madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: Axeman on November 10, 2019, 10:01:07 PM

Title: Harbinger 1.5 Bulb pulsating momentarily
Post by: Axeman on November 10, 2019, 10:01:07 PM
So I finished My Harbinger 1.5 today when I powered it up 9V the bulb pulsated for about 3 seconds and the light remained steady.  so I disconnected the power and tried it again, and same thing pulsates then stops. ??????
Any help
Title: Re: Harbinger 1.5 Bulb pulsating momentarily
Post by: Axeman on November 11, 2019, 04:33:40 PM
OK got it working Q11 and Q12 (MPSA13) replaced.  The way I figured it out was by shorting the ground on Q11.  Hope that helps someone else.