Help with some offboard wiring

[gabrield]

Hi, I'm attempting a smokey amp as my first build and I was wondering If someone could help me with wiring up a DC jack and battery clip.
I'm using the layout below and I would like to wire it with a DC jack and the option to use a battery. I was also wondering where I would need to put the on/off switch. I'm guessing I can't just solder the jack and the battery clip into the same place, so any help would be thoroughly appreciated.


Thanks in advance.

[boogietone]

There are several diagrams on the net on how to hook up a batter and DC jack. Check out http://www.generalguitargadgets.com/tech-pages/50-powering-effects. geofex.com should have an article on this as well. Many schematics also show this. The DC jack to use is one that has an internal contact whereby the battery is used if there is no plug in the jack and it disconnects the battery when you insert the power plug.

[gabrield]

Ok thanks for the link. Just one more question. If I wanted to add in an on/off switch would I just need to place it between the DC jack and the power input?

[boogietone]

Are you asking about a signal bypass switching arrangement to kick the effect in and out of the signal chain while playing or more of a power on/off type arrangement. Both are pretty easy to implement and are often used together. For the power on/off circuit, the usual way is to use a stereo 1/4" jack for the input jack of the effect. The jack is wired such that while a cable is plugged into the jack the power is "ON" and when the cable is removed the power is "OFF." This is the way most pedals work (commercial, boutique, and DIY) and why it is recommended that you unplug your effects when not in use. This way you do not require a separate on/off switch. Both this and "true bypass" wiring can be found at generalguitargadgets, geofex, and I believe in the faq section of the forum. Let me know if you need help drilling down to the correct links.

[gabrield]

Well I plan to use this as a practice amp so I don't think I need a stomp switch. I just wanted to be able to turn it off while the guitar is still plugged in, I'm pretty sure I just need to put an SPST switch somewhere between the power source and power input on the board, is this correct?. Sorry one more thing, I just had another look at the layout and I realised that some of the capacitors have positive and negative sides (220uF) , but the others don't. Are these two different types, in which case what types should I use?

Sorry if I'm being a bit of a noob and thanks for your help so far.