A pair of thyristors in a controlled full-wave bridge configuration provide a 100Hz rectified supply. This is smoothed by an active smoothing circuit to give a DC supply of 1. 56V. The thyristors only conduct for a short period when they are triggered in the latter half of each mains half-cycle. Stabilisation of the DC output voltage against both m
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ains voltage changes and load variations is achieved by controlling the conduction angle of the thyristors. The trigger pulses are produced by a silicon controlled switch with a phase control circuit which senses the mains input and the DC output voltages. At switch-on, the phase control circuit provides slow start-up. In addition to the normal CRT beam current limiter in the signal circuits, further protection is provided by reducing the power supply output voltage if the EHT current becomes excessive. A monostable gating circuit inhibits spurious thyristor triggering by spikes which may be present on the incoming mains supply. Over-voltage protection is incorporated. Two diodes A/B of the four-diode encapsulation D4005 along with the two thyristors SCR4018/20 form a controlled full-wave (100Hz) bridge rectifier circuit. Thyristor conduction, and therefore the power into the load is controlled by changing the phase of the thyristor trigger pulses, and by this means a stabilised DC output is obtained. All four diodes of D4005 form a second full-wave bridge rectifier to provide a separate 100Hz supply for the trigger pulse generator SCS4061. The input bridge circuit is such that the receiver chassis is floating at about half-mains potential irrespective of which way round the mains connection is made. Two fuses FS1301/02 are fitted, so that, regardless of which mains input lead is live , there is protection for a short...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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