| Creator: !mURx |
| Date: 2002-05-20 |
Rating:  |
| |
Beschreibung
My HiFi system has only two line-ins but I need at least four (TV, DVD, PC, notebook) and the PC and the notebook have a low output level. There was only one solution: a mixer/preamp!
The TV gets its own line-in (ego) while the other devices are connected via a mixer (which adds the three inputs through two 741 OPs), the default amplification is v=1.00 but it can be altered for each of the inputs.
Of course the OPs need a positive and negative voltage. It wouldn't be difficult to equip a small transformer featuring two secondary windings with a rectifier and voltage regulators, but why if the HiFi system itself provides these voltages?
And there you are, I had barely opened the cover I arleady saw a few nice regulators: 7807 and 7907, which means +7V and -7V.. Perfect! |
 | Badass cut-out in the back cover of the HiFi system (made with a side cutter) |
 | 9-pin SUB-D connectors rule if you don't have any other suitable connectors |
 | Connected on the inside (there are a lot of circuits in there :) |
 | Potentiometers to choose the selective amplification. |
 | The PreAMP on top, the case was taken from some old Telecom device. |
 | The different channels of the mixer and the amplification can be controlled on the front panel |
 | Chinch jacks for the signals and a SUB-D connector for the voltage supply. |
 | The two power LEDs were added at the last moment. |
 | Way too hitech/ghetto to understand :) |
 | The cable of an old serial mouse was used for the voltage supply. |
 | and is connected to the HiFi system. |
Rate this mod |
| The more Arnolds the better! |
|
|
| Prior ratings: 4 |
