The C945 is an age old Japanese Bipolar audio frequency NPN transistor. It has a decent gain value (hfe) of maximum 700 and is highly linear. Hence it was widely used in amplifier applications for pre-amplifying purpose, in high frequency circuits. It is also used as oscillators with is complementary A733 PNP transistor. When used as a switch it can easily by controlled by a MCU/MPU since it has a base voltage of only 5V. It can switch loads upto 50V but has a very low collector current rating of only 150mA so this transistor is not really a good choice to be used as a switch. A better alternative for switching applications will be 2N2222.
“This emulator allows communication with I2C devices by sending or receiving data to/from the I2C bus through a PC. The I2C master mode emulator allows communication with I2C devices by sending or receiving data to/from the I2C bus …
“This is real-time clock based automatic LED lamp which we originally designed to use as night light. This lamp can programmed to turn on and off at the specific time of the day. For example, it can program to turn …