I'm designing a power supply for my semi-acoustic guitar. Instead of buying 9v batteries, I'll have it powered by phantom power.
This has three parts to the project:
1/ Design a step-down transformer 48v DC to 9V DC.
2/ Design a Matching transformer circuit to convert a guitar impedance to microphone level.
3/ Re-wire the pickup power circuit with a relay to switch between Phantom Power and Battery Power automatically - Depending on the type of plug inserted in the guitar, Mono (no power) or Stereo (9v Power).
Have you come across any websites that can help me with designing a drop down transformer?
Good luck with your projects.
transformers require ac so experiment with a tranformer, a full wave bridge rectifier, a filter capacitor and a adjustable regulator.
try google to get the exact values or see if you can buy one. A 9v battery charger might work for you also. do your own calculations.
I am working with DIGIKEYs "SCHEMEIT" schemit schematic package on a solution to send you. I'm not OCD, but I like working to relatively close tolerences. I hope to have something in the next few days. KEEP THINKING !
I have successfully e-maile my generalized schematic to myself and my wife, so it works.
If you want to send me your e-mail address I will send you the schematic. I have not selected components, but I put a 9 volt zener in it to protect your guital/instrument.