>> I was using the cmoy to preamp the signal coming from my sansa fuze...   OK, that makes sense: you're feeding your Fuze's output (designed to drive low-impedance phones, ie low voltage/high current) into your vehicle's amp (high impedance requiring higher voltages). The cMoy is a good fit...

>> Also, do you know of any way to improve the battery life besides just hooking up batteries in parallel?   There are other cMoy variations out there that have simple charging circuits for rechargeable 9V batteries (cMoyBB and Mini^3 for example). If you're circuit-savy enough you could...

Ok cornman! You solved your problem while I was composing my last post.    re. using your CMoy (or any other electronics) within your vehicle's electrical system: You should assume that your vehicle's cigarette lighter is designed to .... light up cigarettes. It may not be regulated, so that...

re. 'rail splitter': I didn't realize that your circuit (as you've followed Tangent's instructions) has a passive virtual ground - consisting of R1+/- and C1+/-. A rail splitter is a voltage regulator IC device that generates an exact midpoint voltage between its 2 inputs. It's an improvement...

Hi cornman   In your opening post you mention plugging your CMoy into your cigarette lighter while using it with your car's sound system. Don't do this!   Your sound system's ground connection is likely tied to vehicle ground (the neg terminal of your car's battery). When you power your...

I've built a couple of CMoys with slightly different input stages from Chu Moy's design (written up in HeadWize: "A Pocket Headphone Amplifier"). For evaluation purposes I wanted a unity gain amplifier with an audio bypass switch. That allows me to easily compare the amp's output to the...