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| Joined: | Sep 22nd, 2008 |
| Location: | Doylestown, Pennsylvania USA |
| Posts: | 130 |
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This SC1088 is the same chip as the old Philips TDA7088T and is the very same receiver I use in my Joe's Box. I use two TL555 timers to drive the tuner "scan" button and the "reset" button. I have rate controls for scan speed and sweep width as well as volume/power. I use an LM386N audio amp chip with a 2inch speaker. I use 3 AAA cells and still stay within the receiver chip max rating.
When you couple the output to an amp from this circuit's earphone jack you need to use an audio coupling transformer such as a mini 400ohm to 400 ohm unit. The earphones are the load for the audio driver transistor and you need to substitute the primary winding for the earphones.
joecioppi