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Radio Controlled 3way Light Switch - TRIAC based 3 way light
switches are very uncommon. Typical circuit representative of those used in
most light switch type digital timers. The timer module is normally a PIC or
custom chip, and it syncs to the AC line so that a trigger pulse can be
supplied at the right moment....[Reverse engineered schematic by Stepan
Novotill]
RC lowpass filter expands microcomputer’s output port - 21-Jun-07 Issue of
EDN A simple lowpass RC filter allows a single output pin of a microcontroller
to expand the number of output bits....[Design Idea by Rex Niven, Forty Trout
Electronics, Eltham, Victoria, Australia]
RCD Programmer - Built with resistors, capacitors and diodes....
RCD Programmer (DIY) - I believe that the "JDM Programmer" is cheap and very
useful PIC Programmer. However, since "JDM Programmer" cannot control VDD, the
algorithm "VPP before VDD" is inapplicable. Programming to the latest device from this
reason may go wrong when using CONFIG settings as "Internal oscillator" "MCLR OFF".
These devices are given power from….(electronic schematic added 11/08)
RCEN fuse bit programmer - With this stand alone programmer you can enable
or disable the internal RC oscillator of AT90S1200 or AT90S1200A.….(Circuit design
added 03/09)
RDS Encoder - schematic only (schematic / circuit added 6/07)
Real Time Clock PCF8583 - The PCF8583 is a clock/calendar circuit based on a
2048-bit static CMOS RAM organized as 256 words by 8 bits. Addresses and data are
transferred serially via the two-line bidirectional I2C-bus. The built-in word address
register is incremented automatically after each written or read data byte. Address
pin A0 is used for programming the hardware address, allowing the connection of two
devices to the bus without additional hardware.The built-in 32.768 kHz oscillator
circuit and the first 8 bytes of the RAM are used for the clock/calendar and counter
functions. The next 8 bytes may be programmed as alarm registers or used as free RAM
space. The remaining 240 bytes are free RAM locations. ….(electronic schematic added
11/08)
