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Microprocessor Circuits   Page 6a
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Last Updated on: Wednesday, November 29, 2017 05:40 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Phase Modulated PWM Topology with the ML4818/ AN-42026 -  Fairchild Application Notes / (app note added 6/06)
Phoenix Programmer -  This circuit will allow you to place a phone call on hold and if you wish to have them listen to music while they are on hold.….
Phone Intercepter 1 -  This device connects between the phone line, an answering machine, and your phones.  When a phone call comes in, the answering machine picks up the call and informs the caller to enter….(Circuit design added 05/09) [Luhan Monat - Mesa Arizona]
Phone Interceptor 2 -  This unit is an upgrade of the previous phone call interceptor. Instead of using an answering machine to provide the outgoing message and recording functions, it uses the ISD4004 ….(design added 05/09) [Luhan Monat - Mesa Arizona]
Phone Line Box -  Creating projects that connect to the phone line can be a real chore without some device like this. It generates the 48 volts DC for the on-hook condition, the 100 volts AC for the ring signal, and the 20 milliamperes DC for the off-hook condition.….(Circuit design added 05/09) [Luhan Monat - Mesa Arizona]
Phone Messager -  I always keep one totally self powered phone (the way they all used to work) in case of a power failure.  This device works the same way, taking all of its power directly from the phone line…. [Luhan Monat - Mesa Arizona]
PIC 16f84 Clock -  Can be used to turn off devices after specified time....
PIC 3rd Harmonic Meter -  The PIC board detects 3rd harmonic distortion of AC power line. ….(electronic schematic added 06/09)
PIC 5x7 Display -  (schematic / circuit added 10/02)
PIC ADC a Free PIC Based intelligent A/D Converter -  (design circuit added 8/02)
PIC Based Motor Controller -  (circuit / schematic added 2/03)
PIC Based Packet Radio Encoder -  (electronic circuit added 7/03)
PIC Based RS485 Multiplexer -  Recently, I had to design a circuit real quick that transmitted 4 parallel TTL data bits over 350m of twisted pair cable. I needed to feed in four parallel data bits at one end, and get 4 parallel data bits out the other end, completely transparent to the transmitting and receiving circuits(added 8/06) 
 
PIC Caller ID -  Caller ID circuit displays name and a telephone number of the person that is calling you. Information is decoded using MT8870 DTMF decoder and PIC16F628 microchip and is displayed on 2x16 LCD. ….(design added 11/08)
PIC Controlled DDS VFO 0 to 6 MHz -  ....
PIC debugging routine reads out binary numbers -  12/07/00 EDN-Design Ideas.The “burn and learn” method of firmware development excludes an in-circuit emulator and a serial port.With this method, it is common practice to use spare I/O pins on a mC as a debugging aid. By strategically placing instructions to set and clear these I/O pins in the code....PDF contains multiple circuits, scroll to find this circuit....[Design Idea by Brad Peeters, Theta Engineering Inc, Costa Mesa, CA]
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