This is a circuit diagram circuit AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout. Designed popular ZN414 IC this receiver covers medium wave band band from approximately 550-1600 KHz with the values shown. The coil and tuning capacitor can be taken fro
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m an old MW radio to save time. The ZN414 IC, has now been replaced by the MK484. Integrated circuit is a 3 pin, tuned radio frequency circuit, and includes several RF stages, automatic control and AM get detector. It is easy to overload and voltage IC operation rather important to achieve good results. The following is a schematic drawing: In this circuit a small voltage regulator built around BC108B transistors, four diodes are 1N4148, the 2k7 and 10k resistors and 820R preset resistor. 10k pot that serves as the control of selectivity for the receiver, controlling the operating voltage for the ZN414 (or MK484). If you live in an area that is absorbed by strong radio signals, then the voltage may need to decrease. I found the optimal performance with a supply of about 1. 2 volts. Audio amplifier is built around strengthening inverting 741 op-amp circuit. Increasing the extra flow provided using BC109C / BC179 transistor complementary pairs to drive an 8 ohm loudspeaker. Voltage gain full audio amplifier is around 15.
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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