Timeline for Speaker BJT Amplifier - very low gain
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 4 at 15:34 | history | edited | JRE | CC BY-SA 4.0 |
added 22 characters in body
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| Jul 4 at 15:30 | answer | added | sura keneni | timeline score: 0 | |
| Jun 17, 2016 at 8:27 | answer | added | Andy aka | timeline score: 0 | |
| Jun 17, 2016 at 7:44 | answer | added | Bordodynov | timeline score: 1 | |
| Jun 16, 2016 at 16:54 | comment | added | user57037 | Suggested reading: Nelson Pass Zen amplifier, or Douglas Self's various writings on audio amplifiers. Your output stage is not practical for a power amplifier. All the current that goes to the speaker has to pass through R5. | |
| Jun 16, 2016 at 16:50 | comment | added | user16324 | Did you even look at any audio power amplifier design before you started? | |
| Jun 16, 2016 at 16:15 | comment | added | JIm Dearden | This circuit cannot be used as a POWER amplifier. Its a voltage amplifier but it has virtually no current driving capability. Connecting a 4 ohm speaker at the final stage is like adding a short circuit to the output. | |
| Jun 16, 2016 at 15:36 | comment | added | WhatRoughBeast | @Psydia - Oh yass. You need a push-pull stage. | |
| Jun 16, 2016 at 15:30 | comment | added | foemre | I'll increase the space between components now and repost the schematic, thanks. The 1mF caps appeared to work well, but I could go with the 470uF ones and have a little bit more but still not too much distortion. @WhatRoughBeast so I need to redesign the third stage I assume? | |
| Jun 16, 2016 at 15:25 | comment | added | uint128_t | Please space out your schematic, it's very hard to read. Also, you might consider linking us the LTSpice file so we can verify your simulation. Finally, the 1 mF capacitors look suspicious, are those the intended value? | |
| Jun 16, 2016 at 15:24 | comment | added | WhatRoughBeast | Your values for R4 and R5, especially R5, limit the current available to the low resistance of the load, so the load power is very low. Ignoring C2 for a moment, the maximum voltage across the speaker is 24 x (4/2204), or about 44 mV, for a maximum peak power of 47 uW. | |
| Jun 16, 2016 at 15:22 | review | First posts | |||
| Jun 16, 2016 at 15:23 | |||||
| Jun 16, 2016 at 15:19 | history | asked | foemre | CC BY-SA 3.0 |