Dr.EM
New Member
I would like to make one of these effects. They allow you to lower bit rates and alter sampling frequencies of an incoming signal for "lo-fi" type effects. My plan is to use an 8-bit ADC chip, giving a maximum of 8-bit resolution. To alter the bit rate down, I intend to be able to switch out the LSB's with 4066 CMOS switches, I think this would achieve the right effect?
To alter the sampling frequency I plan to have a set of latches on the digital outputs (the 4516 chip using the parellel load feature) which are latched by a variable frequency oscillator. By lowering the oscillator frequency, the number of samples passed per second can be reduced?
The only ADC chip I can get easily is the ADC0804LCN. It seems to be designed to be used with microprocessors, which I don't intend. Is it suitable? Also, the conversion time is a little long at under 100uS, I hope it is under it by a bit, but it shouldn't matter too much.
Looking at the datasheet, page 11's free running connection looks suitable? It generally looks a bit of a hassle to hook up (seperate grounds for analogue and digital?), is there much chance of getting one working (and a breadboard test is required too).
To alter the sampling frequency I plan to have a set of latches on the digital outputs (the 4516 chip using the parellel load feature) which are latched by a variable frequency oscillator. By lowering the oscillator frequency, the number of samples passed per second can be reduced?
The only ADC chip I can get easily is the ADC0804LCN. It seems to be designed to be used with microprocessors, which I don't intend. Is it suitable? Also, the conversion time is a little long at under 100uS, I hope it is under it by a bit, but it shouldn't matter too much.
Looking at the datasheet, page 11's free running connection looks suitable? It generally looks a bit of a hassle to hook up (seperate grounds for analogue and digital?), is there much chance of getting one working (and a breadboard test is required too).