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Voltage reduction

Andy Betts

i build guitar effects pedals for a hobbie, and I have a modification I'd like to carry out and i'm hoping some of you may be able to guide me with a solution.

 

Ok... Here's my plan. I have 2 effects pedals... An electric mistress which runs on 18v (it actually has a voltage regulator inside it with reduces the voltage to around 13v but it does run on 2 9v batteries), the second pedal is a boost pedal which runs a single 9v battery which i currently run after the electric mistress to boost the output. The problem with the electric mistress is when you engage the effect the output volume drops by around 10 to 15%, so the boost pedal compensates for that drop.

 

What i want to do is build the boost circuit into the electric mistress enclosure.. so the guitar will go into the electric mistress travel through the mistress circuit to the output of the circuit then into the boost circuit, then to the output jack socket. Simple, but i have a dilema inso far as they each run on different voltages, so how can i regulate the 18v DC down to 9vdc for the boost part of the circuit? If they both ran on the same voltage it'd be easy.... but i'm a little lost with this.

 

I've been told to use a resistor but I've also been told that's not the right way to do it.... Any ideas?

Parents

  • Andy,

     

    I would not know without looking at the schematic, but sometimes it is possible to run circuits from higher voltages (i.e. it might be possible to run both circuits from the same source).  You would have to determine if all of the circuits on the low voltage board could be driven from the higher voltage (i.e. transistors, etc.). Also you would need to look at any biasing circuits to see if they would function at the higher voltage.

     

    Good luck,

    Gene

  • in reply to genebren

    Andy,

     

    I found the schematic that you had posted awhile ago (TL061 op-amp), and it looks like the circuit will operate at 18V.  The only thing that you might need to check are the voltage ratings on you capacitors.

     

    Gene

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  • in reply to genebren

    All my caps are rated at 50v minimum. Some as high as 100v, it all depends on the physical size of the capacitor. Sometimes i'm being led by size and what will look good on the board, in a lot of cases on vintage pedals they use 1/2w resistors so bigger than normal 1/4w, and also they tend to use 100v caps, therefore they are normally bigger. On the booster that I built i used small 1/4w resistors, and 50v caps