Welcome to Microprojects home page. Your interest is appreciated. Select a product line and click on Data Sheet to download PDF document. You need "Acrobat reader" to view those data sheets. You can download free Adobe Acrobat reader software from their web site . We also release the source code for some of our products. Links with +SRC mark next to them include the source code. All the source code is released under GPL liscense. Please read this liscense carefully and if you agree with it then you can download the source code. Following data sheets and (or) source code are available for download: HTC150: Four channel LED flasher.+SRC HTC151: Four channel LED flasher.+SRC HTC550: Monostable multivibrator.+SRC HTC551: Power up sequenser.+SRC HTC555: Clock generator.+SRC HTC601: CPU supervisor.+SRC HTC602: CPU supervisor.+SRC HTC603: CPU supervisor.+SRC HTC750: Melody generator.+SRC HTC751: Programmable melody generator.+SRC HTC752: Melody generator.+SRC HTC852: Simple PWM controller.+SRC HTC2500: Simple digital clock controller.+SRC HTC2501: Simple digital alarm/clock controller.+SRC HTC2502: Simple analog clock controller.+SRC HTC2503: Simple analog clock controller.+SRC Product Description Information HTC150 Top This circuit controls four groups of LED's and useful for creating light effects. Download Data Sheet (89K). Download source code(212K). HTC151 Top This circuit controls eight groups of LED's and useful for creating light effects. Download Data Sheet (160K). Download source code(108K). HTC550 Top Flexible monostable multivibrator. Does not require external components for operation. Can generate output pulses on rising or falling edge of trigger signal. Up to seven programmable output pulse duration's ranging from 1uS to 10S. Replaces classic 555 in monostable multivibrator circuits. Download Data Sheet (82K). Download source code(211K). HTC551 Top Power up controller. Can control power up sequence of up to three power supplies. Does not require external components for operation. Programmable startup delay. Download Data Sheet (52K). Download source code(210K). HTC555 Top Digital version of classic 555. Replaces 555 in frequency generator circuits. provides 1% accurate frequency output at room temperature. Programmable thirty-two output frequencies covering rang from 1Hz to 100KHz.Does not require external components for operation. Download Data Sheet (57K). Download source code(277K). HTC601 Top CPU supervisor. Note that this product was not tested and this is an unfinished project... Download source code(92K). HTC602 Top CPU supervisor. Note that this product was not tested and this is an unfinished project... Download source code(38K). HTC603 Top CPU supervisor. Note that this product was not tested and this is an unfinished project... Download source code(53K). HTC750 Top Melody generator. Useful in musical projects like musical doorbell, melody generator for alarm clock, musical toys or boxes. Four programmable melodies are available in each part of this series. Melody samples of each device are available for download. Download Data Sheet (154K). Download source code(994K). HTC750A - Sound samples(383K). HTC750B - Sound samples(603K). HTC751 Top Programmable melody generator. Useful in musical projects like musical doorbell, melody generator for alarm clock, musical toys or boxes. It uses external serial EEPROM for melody storage. Melody compiler is available for HTC751and it is free. Download Data Sheet (156K). Download source code(470K). Download melody compiler, second release (2.08M). If you downloaded previous version, you can download only executible and replace it on your install directory ( default path is c:\program files\melodycompiler\ ). Melody Compiler executable : MelodyCompiler.exe(108K). HTC752 Top Melody generator. Note that this product was not tested and this is an unfinished project... Download source code(50K). HTC852 Top General-purpose PWM controller with fixed output frequency of 31250Hz. It requires minimum number of external components and provides wide range of power control ( 32 possible settings). It's very easy to use and provides general DC power control solution in wide range of applications. Download Data Sheet (52K). Download source code(86K). HTC2500 Top Simple digital clock driver. Requires minimum external components for digital clock construction. Designed to work with common cathode seven segment LED displays. Uses popular 32768Hz crystal as time reference. Build using our micro RTOS. Download Data Sheet (93K). Download source code(808K). HTC2501 Top Simple digital alarm/clock driver. Requires minimum external components for digital clock construction. Designed to work with common cathode seven segment LED displays. Uses 4MHz crystal as time reference. Build using our micro RTOS. Note that this product was tested but newer released to production... Download source code(152K). HTC2502 Top Analog clock driver. Output can control solenoid type of moving mechanism. Output pulse is programmible to allow mechanical delays. Supports operation from backup power supply in case of main power failure. Applications benefiting from this IC range from wall clocks, centralized clock systems to tower clocks. Download Data Sheet (53K). Download source code(160K). HTC2503 Top Analog clock driver. Output can control stepping motor type of moving mechanism. Supports operation from backup power supply in case of main power failure. Could be used in wall clocks with solar cell as primary power and dual layer capacitor as energy storage and backup power source. Download Data Sheet (52K). Download source code(123K).