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 Audio Frequency Power Amplifier,Low Speed Switching Transistor 2SD382 ( NEW ) US $8.50 
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 Audio Frequency Power Amplifier Transistor 2SD414 ( NEW ) X 2 pcs US $3.80
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 TDA1015T TDA1015 -- 0,5 W audio power amplifier IC US $9.90
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 2x 2SA1146 + 2x 2SC2706 Power Audio AMP Transistor US $18.99
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 LM4755T LM4755 -- Stereo 11W Audio Power Amplifier IC US $6.88
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 TA8231L - TA8231 42W BTL x 2CH AUDIO POWER IC US $9.99
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 100pcs MC34119P MC34119 34119 DIP-8 DIP8 Motorola Low Power Audio Amplifier US $82.46
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 100pcs MC34119 34119 SOP-8 SOP8 Motorola Low Power Audio Amplifier US $81.29
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 TDA2030A Audio Power Amplifier DIY Kit Components OCL 18W x 2 BTL 36W US $1.52
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 2SA1106 PNP PLANAR TRANSISTOR(AUDIO POWER AMPLIFIER, US $1.95
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 2SC5200 High Power Audio Amp Class B transistor NPN US $.99
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 10PCS LM3886 TF Audio Power Amp IC HiFi Chip Amp US $73.99
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 5pcs,Audio Power Amplifier w/Mute IC LM3886 LM3886T NEW US $33.80
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 13, Audio Power Amplifier w/Mute IC LM3886 LM3886T NEW US $87.90
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 FJA4213 PNP Audio Power Amp Transistor 250V 17A US $.99
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 STK1070 Single-Channel Audio Power-Output Am BY SANYO LOT OF 2 US $39.00
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 NEW 2-channel class AB audio power IC - STK433-730S US $21.40
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 MJ15025 PNP Audio Power Amplifier transistors TO3 US $2.90
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 MJL21193 Audio Power Amp transistor 200W 16A PNP US $3.40
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 MJL4281A Audio Power Amplifier transistor Hi-Fi x2 MJL4281 US $7.70
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 5 x Power Audio Amplifier PNP Silicon Transistor 120V US $6.74
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 NEW AN7161NFP AN7161 HIGH AUDIO POWER AMPLIFIER US $7.45
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 MJL21193, Power Transistor, 16A 250V, PNP, Audio, Qty 4 US $22.49
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 MJL21194, Power Transistor, 16A 250V, NPN, Audio, Qty 4 US $22.49
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 NEW MJ15018 POWER AUDIO TRANSISTOR US $3.25
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 MJ15024 NPN Audio Power Amplifier transistors TO3 x2 US $4.90
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 2SC3856 NPN PLANAR SILICON TRANSISTOR(AUDIO POWER AMPLI LOT OF 10 US $28.00
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 Audio Amplifier NPN Silicon Power Transistor 2SD1047 US $3.75
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 TA8210AH 20W BTL2ch audio power amp BY TOSH LOT OF10 US $33.00
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 NEW MJ15023 AUDIO POWER TRANSISTOR, PNP, TO-3 US $3.25
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 NEW 2SD425 AUDIO POWER TRANSISTOR US $3.25
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 Audio Power Amplifier Dummy Test Load 8 OHM / 100 Watts US $9.99
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 SPR 100K Power Precision Resistor 5W 1% Low Noise Audio KOA USA x8 US $4.90
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 BDW94 Darlington PNP Power Transistor 100V 12A Audio Qty:5 US $7.50
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 TDA2051 40W Hi-Fi AUDIO POWER AMPLIFIER BY ST US $4.95
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 BDX34 Darlington PNP Power Transistor 100V 10A Audio US $1.88
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 20 pairs MJL3281A MJL1302A Audio power Transistor US $117.50
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 2PCS D675 2SD675 Audio Power Transistor MOT TO-3 US $8.85
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 5PAIR 2N6609 + 2N3773 Audio Power AMP Transistor TO-3 US $19.95
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 2PCS B655 2SB655 Audio Power Transistor MOT TO-3 US $9.98
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 Power Amplifier KIT 56W rms Audio HiFi Amp Low THD K333 US $19.00
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 50PCS Audio Power Transistors MJ21194 MJ 21194 NEW US $80.80
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 TESTED RCA 845 / VT-43 HIGH POWER AUDIO AMPLIFIER TRIODE US $61.51
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 USED & TESTED TAYLOR TUBE 805 / VT-143 HIGH POWER AUDIO TRIODE US $9.99
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 20P AUDIO POWER AMP W/MUTE IC LM3886 LM3886T NEW (A174) US $106.80
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 20PCS, 2N6284 Audio AMP Power Transistor TO-3 100V US $47.50
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 Class AB Audio HiFi Power Amplifier Trainer Build / learn /modify K48 US $15.72
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 TA8251 Quad Audio Power Amp Chip Toshiba, 0.02% THD x2 US $3.79
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 1 PCS TDA7379 AUDIO POWER AMPLIFIER ZIP NEW US $8.99
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 1pair (MJ15003 NPN + MJ15004 PNP) Audio Power Amplifier transistors TO-3 New US $2.99
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 10pairs (MJ15003 NPN + MJ15004 PNP) Audio Power Amplifier transistors TO-3 New US $32.99
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 1pair (MJ15022 NPN + MJ15023 PNP) Audio Power Amplifier transistors TO-3 New US $3.89
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 10pairs (MJ15022 NPN + MJ15023 PNP) Audio Power Amplifier transistors TO-3 New US $38.99
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 LM4780 Dual Audio Power Amplifier IC 2x60W Amp HiFi US $9.90
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 1pair (MJ15024 NPN + MJ15025 PNP) Audio Power Amplifier transistors TO-3 New US $3.29
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 2 Pcs 15A 60V NPN Audio Power Amplifier Transistor US $4.41
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 10pairs (MJ15024 NPN + MJ15025 PNP) Audio Power Amplifier transistors TO-3 New US $36.99
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 50, Audio Power Transistor NPN MJ21196 BY MOT TO-3 NEW US $96.00
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 50PCS B655 2SB655 Audio Power Transistor MOT TO-3 US $135.80
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 200X Toshiba TA7222AP Audio Power Amplifier Output IC US $363.99
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 50PCS D675 2SD675 Audio Power Transistor MOT TO-3 US $135.50
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 5PAIR, 2N6284 + 2N6287 Audio AMP Power Transistor TO-3 US $27.50
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 5P STA575 2 x 100W BASH Audio Power Amplifier ST Brand US $34.88
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 20PCS TDA7376B TDA7376 POWER AUDIO AMPLIFIER IC IC'S US $84.45
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 50PCS 2SC3281 C3281 NPN Audio Power Transistor NEW US $111.80
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 4PCS MJ15025 Audio Power Amplifier transistors TO3 US $11.50
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 4pcs LM391N-100 Power Audio Amplifier IC Driver IC'S US $21.90
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 5pcs MJL3281A MJL3281 NPN Audio power Transistor 30MHZ US $14.45
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 5PCS MJL1302A MJL1302 PNP Audio power Transistor 30MHZ US $14.95
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 5PCS MJ15025 Audio Power Amplifier transistors TO3 US $11.95
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 2PCS 2SA1302 A1302 NPN Audio Power Transistor NEW US $7.98
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 5PCS MJ15024 NPN Audio Power Amplifier transistors TO3 US $11.95
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 200pcs Audio Power Transistor MJ21194 new US $338.00
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 Dual 5 Watt Power Audio Amplifier IC LM2878 / LM2878P ( NEW ) US $6.50
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 5PCS JRC386BD JRC386 386BD AUDIO POWER AMPLIFIER NEW US $5.98
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 4PAIR, 2N6284 + 2N6287 Audio AMP Power Transistor TO-3 US $22.88
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 5P D675 2SD675 Audio Power Transistor MOT TO-3 NEW US $21.95
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 4P Toshiba TA7222AP Audio Power Amplifier Output IC US $7.98
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 20pcs MJL3281A MJL3281 NPN Audio power Transistor 30MHZ US $44.90
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 20PCS MJL1302A MJL1302 PNP Audio power Transistor 30MHZ US $58.99
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 20PCS MJ15025 Audio Power Amplifier transistors TO3 US $39.80
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 2 x AUDIO POWER AMP W/MUTE IC LM3886 LM3886T NEW (A174) US $11.88
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 2 x 2N3055 NPN AF Amp Audio Power Transistor 15A 60V US $7.39
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 2pcs, LM391N-100 Power Audio Amplifier IC Driver IC'S US $11.68
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 20 pcs DIP IC LM380N 380N 2.5W Audio Power Amplifier US $31.50
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 2PCS, 2N6284 Audio AMP Power Transistor TO-3 100V US $10.20
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 20pcs LM391N-100 Power Audio Amplifier IC Driver IC'S US $64.99
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 20PCS JRC386BD JRC386 386BD AUDIO POWER AMPLIFIER NEW US $18.88
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 200p Audio Power Transistor MJ21194 new US $338.50
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 2PCS TOSHIBA TA8273HQ TA8273 Power Audio Power IC's NEW US $20.70
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 50 pairs MJL3281A MJL1302A Audio power Transistor US $275.80
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 1x MJ15001 +1X MJ15002 Power Audio AMP Transistor TO-3 US $9.98
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 50X Toshiba TA7222AP Audio Power Amplifier Output IC US $105.29
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 2PAIR, 2N6284 + 2N6287 Audio AMP Power Transistor TO-3 US $11.95
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 5PCS B655 2SB655 Audio Power Transistor MOT TO-3 US $21.85
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 2pair MJL3281A MJL1302A Audio power Transistor US $16.87
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 2 PCS LM3886 LM3886TF 68W Audio Power IC Module - NEW US $11.93
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 2PAIR 2N6609 + 2N3773 Audio Power AMP Transistor TO-3 US $11.99
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Audio Power
When Internet Marketing Promotions Can Suffer If You Use Audio, Video Or Long Sales Letters
I make almost all my money on the Internet using audio, and am a huge advocate of using audio on websites -- whether for selling or educational purposes -- because I have seen the huge jump in response and profits that result. 3
Not only do people get exposed to your message on a whole different level than using just text, but you bond with people in ways you can't get anyway else.
In fact, sometimes when people listen to all the interviews I have done and actually talk to me on the phone, they tell me they feel like they're talking to a "celebrity." When in truth, I am far from it. 3
That's the kind of raw power using audio on your site gives you. For more information visit internet marketing
However, with that said, there are times when having audio on your site will not work. Or at least, depending on audio to the extent I use it will not work.
Such as if you are selling something where there just isn't that much to talk about. Like, for example, if you sell parts to electronic manufacturers or something like that.
True, you can probably find some ways to make a talk out of it. But really, if someone is at your site because they want "part # 138e7e8e" or something like that, they don't want a pitch or to hear a 45-minute talk on the subject. They just want the part. For more information visit internet marketing
In fact, in cases like that, trying to enhance everything with audio, video or a long sales pitch can actually work against you.
So be careful with how and what you use all the new technology for.
Video and audio are both exciting mediums. But they can work against you in some cases if you aren't careful.
Article done by Michael Senoff Article Source: http://EzineArticles.com/?expert=Michael_Senoff
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Frequently Asked Questions...
Audio Power Amplifier Class AB?
i have been assigned to design an AB class audio power (for the final project of a basic course in electronics)amplifier using Opamp : 741 , power transistors BD137,138 , a 12 v. supply , load resistance 8 ohm , voltage gain of 40 dB and cut-off frequency 20 Hz. desperately needing help ! where shall i begin?!
Answer:
Okay, let's make sure we are talking about the same circuit. You have a 741 op amp feeding a class AB output stage. The class AB output stage consists of a push-pull transistor stage with two diodes on the transistor inputs to bias the output transistors slightly on. Is this what you have?
If so here is how I would approach it.
1. Setup the biasing of the output transistors. Normally, a resistor or current source is used to setup a current through the two diodes on the transistor inputs (some folks use transistors for these diodes). See Reference 2 for an example. This current should be sufficient to almost turn on the two output transistors. There is also something called a "rubber diode" that can be used to bias the output. See Reference 1 for an example.
2. Do you require short-circuit protection? If so, there are transistors that must go in the emitter legs of both output transistors. These resistors are used to turn-on additional transistors that will take base drive away from the output transistors. These must be sized to ensure that if the output is shorted that current is limited.
3. Now we design the op-amp stage. We will take feedback from the output all the way back to the op-amp negative input. There will be feedback resistor and an input resistor. Their ratio must be 100, which provides 40 dB of voltage gain.
4. I have not thought about the cut-off frequency for awhile. I would place a capacitor across the feedback resistor that will cause the feedback to rolloff at 20 Hz.
