The signal booster consists of one miniature audio transformer. The transformer is used as an interface between the computer and the cassette player.
Example:
----------- ------------------ -------------- |computer | | Signal booster | | cassette | | | | | | player | | load |<---| out In |<---| ear | |___________| |__________________| |______________|
The signal booster has the following advantages:
1. Isolates the computer from the cassette player which eliminates noise.
2. Increases the audio signal amplitude.
3. Cassette player volume setting can be adjusted to a lower level, thus improving the signal/noise ratio, this lower level setting decreases the inherit noise caused by high level of volume setting of volume control of most cassetter players.
4. Increased signal amplitude, allows for misalignment of the record/playback head, which causes low signal amplitude.
5. No power required.
6. LOW COST
SCHEMATIC:
T1
_green_ || _red______
| ) || ( |
| ct __) || (_8 ohm |
<____| 1K ohm ) || ( |______>
J1_______________) || (___________________J2
blue || white
CONSTRUCTION
1. Drill two # .250 (1/4 inch) holes in a plastic pill bottle, one thru the cap, and the other thru the bottle bottom.
2. Solder transformer leads to jacks(J1) and (J2) as per schematic, then insert into plastic bottle.
note: Don’t use a metal container, the metal prevents the proper isolation and grounding between the computer and the cassette player.
Parts list
T1-1K CT. to 8 ohms-Radio shack (273-1380)
J1 – J2 Radio shack (274-297)
Plastic pill bottle to fit transformer
When using signal booster use a lower volume setting for best results.