The following figure shown the driving of two phase bipolar stepper motor control circuit by using the current controller L6506.
The IC L506 generates the needed signals to drive the inputs of the L298 of this bipolar stepper motor circuit driver.
Two Phase Bipolar Stepper Motor Control Circuit Diagram continued »
This universal down mixer circuit diagram is designed in the case of AM-broadcast receiver modification to enable them as DRM-reception. It operates from 455 KHz to 12KHz whilst the 12KHz output is supplied to the PC soundcard input where it is decoded using the software decoder.
This universal down mixer circuit works at 7-20V supply voltage range, less than 6mA current consumption, and the oscillator frequency of the chosen optional crystal oscillator is 443 KHz with 20×20x8,5mm board dimensions needed.
Universal Down Mixer Circuit Design for AM Broadcast Receiver Modification continued »
An automatic antenna switch circuit diagram is shown in the following schematic. It uses the LM3914 integrated circuit which the output is used to activate transistors as switches to provide 12V DC for the remote coax relays.
This automatic antenna switch circuit requires MPS2907 transistors, LM3014 IC, 5mm 10mA @2V LEDs, 1N914 diodes, all 1/4 Watt 5% resistors and disc ceramic capacitors.
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