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| Thread ID: 103018 | 2009-09-09 10:50:00 | Amp mod not quite working properly | sammo450 (13626) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 808424 | 2009-09-09 10:50:00 | Tonight I decided to put my old radio to use. I pulled out the cassette player and connected a stereo 3.5mm socket to the pins on the amp the reader head used to be connected to. I plugged my PC into the socket, and it works but it's pretty distorted and there is a radio signal and a loud hiss coming through. Does anyone know how to kill the hiss and the radio signal? | sammo450 (13626) | ||
| 808425 | 2009-09-09 10:54:00 | A bit of a problem with signal levels there -? You may have more success if you try feeding the signal into the volume control of the radio. The levels may be a little more compatible, but try to use a capacitor on each of the inputs to isolate any stray DC from causing surprises. Good luck with your endeavours. |
R2x1 (4628) | ||
| 808426 | 2009-09-09 11:01:00 | Yes it could be too high. Do you mean wire the signal onto the volume pots? | sammo450 (13626) | ||
| 808427 | 2009-09-09 11:52:00 | Yes - it could be that the signal comes in via the moving contact, or from the fixed non-earth contact. The following tests should only be tried on a solid-state set. For a valve radio, get your wife to put her finger on the terminal in case there are seriously dangerous voltages there. To see which is which, try a "Blurt test" by momentarily putting one finger on the terminal - it should soon be obvious which one is the input when you vary the volume setting while "blurting". Obviously you want to use the terminal which gives you the greatest control as that comes the closest to allowing a satisfactory match of levels. |
R2x1 (4628) | ||
| 808428 | 2009-09-09 12:05:00 | Touching the pot terminals with my fingers didn't do anything, but touching either of the signal leads to the centre terminal gave a very clear radio signal. One signal on centre terminal, another on side terminal didn't give any wanted sound output. | sammo450 (13626) | ||
| 808429 | 2009-09-09 12:13:00 | Sounds like you have found the right place to feed in your signal :) (As long as it swings appropriately as you vary the volume.) You may need to disconnect the original input to that point, probably easiest to cut a track. Don't forget to use a capacitor to feed the signal in as well as using shielded connecting leads.. Have fun. |
R2x1 (4628) | ||
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