Anthrox
Head-Fier
- Joined
- Dec 5, 2005
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Although I'm starting to take electrical engineering in university my experience with electronics currently only extends to high school courses and modding a few consoles.
I was wondering how hard it would be to add a circuit that would activate on a signal from the input jack (ie. music starts to play) and turn off when it stops (maybe a few seconds delay so it doesn't turn off at the slightest pause?). Also, blue leds seem to come only at a higher voltage and I'm not quite sure how that affects the accompanying resistance i need for it. Also can i simply skip the volume control since my music device has one already? From the diagrams on audiologica it seems like itd be pretty easy to eliminate the potentiometre. Can I simply remove it or do I now have to add something to compensate? I'm hoping to make the amplifier as unobtrusive as possible. Haven't decided on a casing yet.
Here are the parts I currently have selected from digi-key based on suggestions from http://tangentsoft.net/audio/cmoy-tutorial/ should I change/add any? Are 0.1% resistors worth it? I saw in another post that a poster recommended different faraday/voltage ratings, should I be using different ones as well? I'll probably try to pick up the board from the source.
Index Quantity Part Number Description Customer Reference Backorder Quantity Unit Price Extended Price
1 2 P5552 CAP 220UF 35V ELECT NHG RADIAL 0 0.53000 $1.06
2 2 P3104 .1 UFD POLYPROPYLENE CAP 0 1.09000 $2.18
3 5 10.0KXBK RES 10.0K OHM 1/4W 1% METAL FILM 0 0.13600 $0.68
4 5 4.75KXBK RES 4.75K OHM 1/4W 1% METAL FILM 0 0.13600 $0.68
5 5 100KXBK RES 100K OHM 1/4W 1% METAL FILM 0 0.13600 $0.68
6 5 1.00KXBK RES 1.00K OHM 1/4W 1% METAL FILM 0 0.13600 $0.68
7 2 CP-43502PM CONN JACK AUDIO 3.5MM 4COND 0 4.66000 $9.32
8 1 OPA2227PA IC DUAL PRECISION OPAMP 8-DIP 0 5.00000 $5.00
9 1 67-1748-ND LED 3MM BLUE/BLUE DIFF LENS 0 2.82000 $2.82
10 1 296-6548-5-ND IC 1/2 RAIL VIRTUAL GRND 8-DIP 0 1.64000 $1.64
(prices are canadian if they seem off)
I was wondering how hard it would be to add a circuit that would activate on a signal from the input jack (ie. music starts to play) and turn off when it stops (maybe a few seconds delay so it doesn't turn off at the slightest pause?). Also, blue leds seem to come only at a higher voltage and I'm not quite sure how that affects the accompanying resistance i need for it. Also can i simply skip the volume control since my music device has one already? From the diagrams on audiologica it seems like itd be pretty easy to eliminate the potentiometre. Can I simply remove it or do I now have to add something to compensate? I'm hoping to make the amplifier as unobtrusive as possible. Haven't decided on a casing yet.
Here are the parts I currently have selected from digi-key based on suggestions from http://tangentsoft.net/audio/cmoy-tutorial/ should I change/add any? Are 0.1% resistors worth it? I saw in another post that a poster recommended different faraday/voltage ratings, should I be using different ones as well? I'll probably try to pick up the board from the source.
Index Quantity Part Number Description Customer Reference Backorder Quantity Unit Price Extended Price
1 2 P5552 CAP 220UF 35V ELECT NHG RADIAL 0 0.53000 $1.06
2 2 P3104 .1 UFD POLYPROPYLENE CAP 0 1.09000 $2.18
3 5 10.0KXBK RES 10.0K OHM 1/4W 1% METAL FILM 0 0.13600 $0.68
4 5 4.75KXBK RES 4.75K OHM 1/4W 1% METAL FILM 0 0.13600 $0.68
5 5 100KXBK RES 100K OHM 1/4W 1% METAL FILM 0 0.13600 $0.68
6 5 1.00KXBK RES 1.00K OHM 1/4W 1% METAL FILM 0 0.13600 $0.68
7 2 CP-43502PM CONN JACK AUDIO 3.5MM 4COND 0 4.66000 $9.32
8 1 OPA2227PA IC DUAL PRECISION OPAMP 8-DIP 0 5.00000 $5.00
9 1 67-1748-ND LED 3MM BLUE/BLUE DIFF LENS 0 2.82000 $2.82
10 1 296-6548-5-ND IC 1/2 RAIL VIRTUAL GRND 8-DIP 0 1.64000 $1.64
(prices are canadian if they seem off)