UglyJoe

Does anybody happen to have a BOM for a CMOY2 with "nicer" parts than the suggest ones? I'd like to make a really nice one to use as a permanent portable amp, but I don't know enough about electronics to differentiate between ok and better parts or to tell which ones are really compatible with the cmoy2 board. Thanks guys.

1bit Thanks for the help. Quick question for you; about how long of a battery life do you get with a single 9V battery? Thats the only reason I am thinking about changing anything, if the battery life is reasonable then I will leave it as is. Since I am just using Grados only for this amp do you suggest I change the gain at all? I will probably just grab an LED here; I am unsure as of yet what kind of enclosure I want to use, going to build the amp then decide based on size issues. Also that POT has a built in switch. Thanks

This will be my first build, and I have a couple of questions. First of all, my headphones are Grado SR125s; I have read that the CMOY2 is similar in design to the A47 and should therefore pair well with the Grados. If anyone has built this amp and used it for Grado headphones please comment on the amp as well as the proper gain setting for these headphones. Here is the part list I was planning on buying: Part Supplier Part# Qty Price Total 10 R Resistor Newark 58K3794 2 $0.109 $0.218 10 kR Resistor Newark 58K3797 8 $0.109 $0.872 LED resistor Newark 58K4959 1 $0.094 $0.094 OPA2227PA Newark 80K6017 2 $3.96 $7.92 LM6171 Newark 41K6219 1 $2.83 $2.83 DIP-8 Sockets Newark 14F2700 3 $2.46 $7.38 uF Capacitor Newark 18C4895 5 $0.342 $1.71 1000 uF Cap Newark 01H8711 2 $0.345 $0.69 3.5mm phono jac Newark 96F9608 2 $2.27 $4.54 9V strap Newark 16N942 1 $0.393 $0.393 POT Tangent RK097 1 $3.25 $3.25 Volume Knob Newark 92N4099 1 $3.07 $3.07 If any of these seem unreasonable or the wrong part please let me know. Also I am assuming that the PCB is still available (I have tried contacting jasonhanjk, but so far have been unsuccessful). If anyone has a CMOY2 PCB for sale let me know. The last question I have is how difficult (or possible) would this design be to mod so that it runs off two 9V batteries or can be plugged into an AC source? Thanks in advance for any help I can get, you guys rock!