I had a plan to have some fun with diy audio kit but for a cheap. No more than $25. The contender to mod is two audio set, one is car stereo and other is home mini hifi.
Many things has been considered, from chipamp kit, split drivers to crossover but in the end I choose a pre-amp stereo.
The reason is both contender has digital audio processor chip and it sound awful, even using individual setting in i4ts audio parameter. Other things is both lost audio setting when disconnected from power source. Being digital and volatile.
Shortly, I order a preamp from a friend at diyaudio facebook group. He has lm1035 tone control to answer my request for a 12volt single supply preamp.
Space wise, no way can fit my car stereo player, so it goes to home mini hifi.
Many things has been considered, from chipamp kit, split drivers to crossover but in the end I choose a pre-amp stereo.
The reason is both contender has digital audio processor chip and it sound awful, even using individual setting in i4ts audio parameter. Other things is both lost audio setting when disconnected from power source. Being digital and volatile.
Shortly, I order a preamp from a friend at diyaudio facebook group. He has lm1035 tone control to answer my request for a 12volt single supply preamp.
Space wise, no way can fit my car stereo player, so it goes to home mini hifi.
This mini hifi has a 4channel audio processor pt2314 and tda7264 at final stage.
Tapping will be dead easy. Tracing from both datasheet, signal path cameout from pt2314 to a series resistor then goes to input caps before tda chip. But it missed the caps and bypassed, seems it hold the 'best caps is no caps' old myth :)
1uf caps input added and resistor removed to provide output to preamp.
Quick test reveal the sonic quality of this mini chipamp, yes of course in low wattage :P
At last the preamp sit behind face plate, secure by hotglue. To finish the work, some holes are drill to allow pots.
It still needs some knobs thou..
