| Electronics > Projects, Designs, and Technical Stuff |
| Basic inline preamp diagram required. |
| (1/1) |
| drummerdimitri:
I watch movies on a projector but the 3.5 mm output signal is too low so even when I turn the volume to the max on my sound system, the loudness is not satisfactory. Would like to assemble a basic preamp to double the output voltage of the signal. Does anyone have a circuit diagram I can use to assemble this device? |
| Tek Tech:
A simple one-transistor amp should work. One for each channel. They can be cascaded if you need greater amplification. [Edited from emitter follower. Thanks to Benta's observation one post below] |
| Benta:
--- Quote from: Tek Tech on April 26, 2019, 04:34:23 pm ---A simple emitter follower should work. One for each channel. They can be cascaded if you need greater amplification. --- End quote --- Just a little problem: emitter followers have a voltage gain of less than 1. Not the right solution. |
| moffy:
Attached is a possible solution. Use an LM833 dual, you get 2 opamps therefore stereo. Has a gain of 2.2 but you need a +/-12v supply as well. Caps should be non polar (not electrolytics) and avoid ceramics for the 1u. |
| MarkF:
Here is a pre-amp for a condenser mic. Maybe you can tweak the gain for your case. |
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