Eathquaker Hummingbird

[JaviCAP]

Hi  guys,

Many people seems to be gettin' problems with this build.

Don't know  where you have  the problem but my unit works like  a dream, after I soldered a 220r + 220uf, because the effect was very noisy with power supply.

I just can tell you that I did follow the layout published by Mark, and after some corrections the effect started to work fine. These corrections are reflected on present layout.

Here you have two pics od the guts in order to show the 2646 orientation and a closer look of the trannie, it just reads "2N2646":





Hope you get it fixed!

[IvIark]

Thanks Javi, here's the schematic

[rael75]

Dear Iviark and Javi,
I am a newbie of diy stompboxes and I'm triyng to build this beautiful tremolo.
I have the well known ticking (as many people around the forum and internet), so I will try to apply the workarounds reported in the thread (by Javi and by Chance).
But...I would like to ask what is maybe a stupid question (but I am a newbie, so please forgive me): you connect many components to GND, but from the schematics it seems different from the "-" of the battery (because you connect only the output connector to this one).
In many pedals projects I saw that GND and the "- pole" of the battery are the same thing.
In this case what is the GND? the metallic enclosure?
Thank you very much for your support and forgive me again for the question (which is very probably highly stupid).
Marco

[rocket88]

Ground is ground and they all must go to the same place which ultimately go to the metal enclosure. The battery has a positive pole and negative pole. The negative pole if the batter goes to ground.

[rael75]

Thank you very much rocket88!

[reddesert]

The schematic is showing the use of a TRS stereo 1/4" jack to switch the battery connection to ground.  The battery negative terminal is connected to the ring of the jack. When a cord is plugged into the pedal, the ring is connected to sleeve which is connected to ground.  When no cord is plugged in, the battery is disconnected, which saves battery power.

This is a common technique for pedals that use batteries. Back in the day, more musicians used batteries in their effects, but now nice regulated 9 VDC power supplies are very common now and many people will just omit the battery. If you use only a power supply, you can connect the negative terminal directly to ground and omit the switching.  If you design for a power supply and a battery, you need to also use a switching DC input jack so that the battery is disconnected when the wall power supply is plugged in.