.. cascading outputs and inputs are again connected as per the 4585 IC datasheet. U4’s Q4=B output is connected to the clock input of U3 and to MR of U1. Hence, counter U1 counts up to 24 and then resets to start from zero. U3’s ...
.. dpot knob at last! See the Figures that follow for how it works. Figure 1. Current-to-frequency converter U1 generates dpot clock pulses at 20 Hz-0-20 Hz, controlled by the sum of Q1+Q2 collector currents set 0 to 5 µA by R1. A1 sets ...
.. a constant voltage of value equal to the system offset that that DAC_B of IC 4 provides. During the first one and a half clock cycles, the ADC samples and holds the positive input. At the end of this phase, or acquisition time, the input ...
.. of V+/3, driving pin 6 high. Now C2 will be quickly recharged through D1 and R4 (this takes ~3 ms), generating another clock pulse to the pot that will duplicate the initial actuation. And so on and so forth, at 4 Hz or so, until the ...
.. are pull-up resistors and C13-C16 are debouncing capacitors for SW1-SW4. OCS is the 16 MHz oscillator XO to prepare the clock for the MCU. T2, T3, R22, and R23 are used for level conversion between the MCU and the OLED display module. ...
.. ~5 ms time constant, and Schmidt trigger inverter U1d then delivers a single clean low-going transition to U2’s clock input. This makes U2’s wiper take one step up if its pin 2 is high (i.e., the UP button is pressed and ...
.. that meets the requirements for the 400-kHz enhanced-I 2 C-bus specification. The I 2 C bus consists of bidirectional clock and data lines (SCL and SDA) that are pulled up with resistors or current sources. Devices connect to the bus ...
.. your programmer to the ISP header on the PCB board and program the MCU. Fuse bits must be set on the 9.6 MHz internal clock, with no clock division (disable DIV8). If you plan to modify the program, its source code is available at the ...
.. a low power voltage comparator. The comparator converts the low voltage pulses into 9 V pulses. Those pulses are fed to the clock input of one half of a CD4013 dual D flip/flop. One section is configured as a half second one shot. The second ...
.. chip that offers 8K flash memory and can run up to 20 MHz with an external crystal oscillator. In this project, I set the clock to 8 MHz-internal. C7 is a bypass capacitor and it has been used to reduce the supply noise. Q1, Q2, and Q3 are ...