This design allows to operate two intercom stations leaving the operator free of using his/her hands in some other occupation, thus avoiding the usual "push-to-talk" operation mode.No complex changeover switching is required: the two units are connected together by means of a thin screened cable. As both microphones and loudspeakers are always in operation, a special circuit...
Monday, January 26, 2015
Thursday, November 20, 2014
8 Relay Control Circuit
8 Relay Control CircuitR1-8=4.7 Kohms T1-8= BD139 (R1-8=15 Kohms if T1-8=BD679) RL1-8=6V-24V dc Relay D1-8=1N4148 &nbs...
Crystal Radio Audio Amplifier Circuit
Crystal Radio Audio Amplifier Circuit Here is a simple audio amplifier application a TL431 blow regulator. The amplifier will accommodate room-filling aggregate from an accustomed clear radio outfitted with a long-wire antenna and acceptable ground. The chip is agnate in complication to a simple one-transistor radio but the achievement is far superior. The TL431 is accessible...
Wednesday, November 19, 2014
Toggle Switch with IR
Toggle switch in this article is a series of toggle switches that are controlled by infrared light. The series toggle switch is made from a combination of data flip-flop CD4013 2 units. Receiver circuit of the infrared light signals arranged with infrared receiver as found on television remote receiver. Infrared signal from remote is used as clock signals and data to the data...
Variable Speed DC Motor Controller 12V
For more details can be seen from a series of Variable Speed DC Motor Controller 12V follows.Series Variable Speed DC Motor Controller 12V This is one series that can be used to regulate speed DC12V motor with PWM technique. Series Variable Speed DC Motor Controller 12V uses a 555 timer IC as a PWM pulse generator to regulate the motor speed DC12 Volt. DC motor speed...
Stereo Power Amplifier STA550
Stereo Power Amplifier 2x70Watt STA550 is chip audio power with BASH concept that can be connected with digital devices. 2x70Watt STA550 Stereo Power Amplifier is an amplifier with BTL system with symmetrical power supply with ground. Power amplifier STA550 uses power output transistor which is on the chip and is set to produce a high efficiency audio power. Power output on...
Tuesday, November 18, 2014
10Mhz to 1 MHz Frequency Converter
10Mhz to 1 MHz Frequency Converter CircuitPart ListIC1 7404 = 1IC2 7490A = 1R 1 K = 2R 3.3 K = 1C Trim Polymer 39 pF = 1C Electrophoresis 4.7 uF 16V = 1C Milar 47 nF 16 V = 1C Milar 10 nF 16 V = 1C Ceramic 68 pF 50 V = 1&nbs...
