switch circuit
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Buick LeSabre
This line provides ground to the relay and is normally open (N-O) when the control unit (CU) is OFF, and is normally closed (N-C) for all other control functions. The OFF switch on the CU is "sticky." Several questions arise:...
80 milliwatt Improved 3 Transistor Audio Amp
This circuit is similar to the previous one but utilizes positive feedback to increase the amplitude to the speaker. It was adapted from a small 5-transistor radio that employs a 25-ohm speaker. In the prior circuit, the load resistor for...
output relay delay audio amplifier
This is a simple circuit designed for an audio amplifier project to control the speaker output relay. The purpose of this circuit is to manage the delay that activates the relay, which connects the speakers to the audio amplifier. The...
Transistor Based Burglar Alarm - Adding Extra Zones
The Transistor Burglar Alarm System allows for the addition of multiple extra zones. The primary circuit is compatible with standard normally-closed input devices, including magnetic reed contacts, micro switches, foil tape, and passive infrared sensors (PIRs). An auxiliary circuit provides...
Relay Computer Two
The simple relay adder was constructed using free NOS relays around 2005, with the intention of eventually creating a more complex version capable of running programs without occupying a large space like early computers. An impressive 415-relay computer was built...
Common base transistor amplifier circuit of a unit
A common base transistor amplifier circuit is characterized by its basic structure, which includes key components such as a biasing resistor, capacitors for coupling, and an amplifying transistor. The circuit features four resistors that establish the quiescent point, with the...
Fast response time of the control transistor circuit b
In a concrete circuit relay application, the transistor VT functions as a high-speed, high-voltage switch. The voltage requirement for switching is 5 to 10 times the rated voltage of the solenoid valve. The circuit is designed for a fast response...
Delaying the release of DC relay circuit
To fulfill the requirements of a control loop, it is often necessary to utilize an electromagnetic relay or a transistor relay to either accelerate or delay an action, thereby forming an acceleration or delay circuit. The circuit depicted in Figure...
Controlled Transistor Series Regulator With Overload and Short-Circuit Protection
If the load resistance (RL) is reduced or the load terminals are accidentally shorted, a very large load current will flow, potentially damaging the pass transistor (Q1), diode, or other components. Fuse protection may not be sufficient, as the transistor...