AP89042_15 Datasheet, PDF (18/19 Pages) Aplus Intergrated Circuits – APLUS INTEGRATED CIRCUITS INC

Integrated Circuits Inc.
CPU Parallel Mode
aP89042
Fig. 14 5V CPU Control with COUT
Note:
1. C1 is capacitor from 0.1uF to 4.7uF depends on the kind of Vdd source and sound loudness.
2. Rb is base resistor from 120 Ohm to 390 Ohm depends on Vdd value and transistor gain.
3. T is an NPN transistor with beta larger than 150.
4. Reference value for the above components are C = 2.2uF, Rb = 390 Ohm and T = 8050D.
5. Refer to the Oscillator Resistor Table for suitable value of Rosc.
Ver5.0
18
Aug 23, 2010