DIY KIT 53- Frequency counter DIY electronic kit

The description has been copied from manufacturer’s website.

This is a PIC microcontroller-based frequency meter, subtraction frequency is set with crystal measurement functions and programmable, five digital display, easy and intuitive, all using in-line components, the circuit is simple and easy to make.

Measurable frequency range: 1 Hz -50 MHz;
Most commonly used to measure the oscillation frequency of the crystal;
Five Accuracy Resolution (eg 0.0050 kHz, 4.5765 MHz, 11.059 MHz);

Automatic range switching, without artificial switching.
Modified programmable frequency settings for the measurement of radio transceivers and other equipment;
Selectable power-saving mode within 15 seconds if there is no significant change in the frequency automatically turn off the display;
You can use a common USB interface as a power supply, can also use an external power supply or 9V battery. (more…)

DIY KIT 52- LM386 based audio amplifier

I have written several projects related to LM386 based audio amplifier. LM386 is a versatile and a widely popular audio amplifier chip. The LM386M-1 and LM386MX-1 are power amplifiers
designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200. The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24 mW when operating from a 6-V supply, making the LM386M-1 and LM386MX-1 ideal for battery operation. (more…)

DIY KIT 51- LM358 based heat and light sensor

This is yet another project based on LM358.  The LM158 series consists of two independent, high gain, internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage. (more…)

DIY KIT 50- LM358 breathing LED circuit

This is a basic electronic kit based on LM358.  The LM158 series consists of two independent, high gain, internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage. (more…)

DIY KIT 49- Dark sensor

This is yet another dark sensor DIY kit. It is slightly different from other dark sensor kits. It has a buzzer and a photodiode that makes it different from other kits. Along with the LED, the kit turns on the buzzer whenever it senses darkness.

See all the images below to get the idea for assembly. You can see all the images on Flickr also.

This is yet another dark sensor circuit

One more dark sensor project

DIY KIT 48- Flame sensor

This is a basic electronic kit for beginners. The kit is based on LM358, an operational amplifier and works as a flame sensor.

The schematic of the kit:

Check out the images below to get tips for assembling the kit. You can see the images on Flickr also.

Other images

 

DIY KIT 47- NE555 based Traffic Signal Light Simulator

The description has been copied from eBay, so, really sorry for the bad English.

When S1 is pressed, U1 NE555 pin no. 2 and 4 will get low level at the same time and NE555’s pin no.3 will also be at low level, 7 pin discharges and 6 pin also gets low level.
If S1 is released, 4 pin will become high level, then pins 2 and 6 will get low level. Therefore, U1 NE555 output pin no. 3 will be high, Q2 is connected to it and the 4pcs LEDs on the left group will turn on. At the same time, Q3 is connected, U2 NE555 outputs low level and the LEDs on the right group will be off.

Work Status:
The controller can control the on/off of the red lamp, green lamp and yellow lamp from four directions.
When the red lamp on the east and west is on, the lamp on the south and north is on, and the cars and passers-by can go across the street;
when the lamp on the east and west is transforming into green from red and the lamp on the south and north is transforming into red from green, the yellow lamp will flash.

A great explanation of the kit is here:


Parameter:

NO. Parameter Value
1 Name Traffic light DIY Kit
2 Operating Voltage DC 4.5-5V
3 PCB Size 90*46mm

Component List:

NO. Component Name PCB Marker Parameter QTY
1 Electrolytic Capacitor C1,C2 22uF/10-50V 2
2 Electrolytic Capacitor C3,C4 10uF/10-50V 2
3 Electrolytic Capacitor C5 1uF/10-50V 1
4 Rectifier diode D1-D4 1N4001 4
5 2*5*7 LED L3,L4,L7,L8 Red 4
6 2*5*7 LED L1,L2,L5,L6 Green 4
7 2*5*7 LED L9-L12 Yellow 4
8 Transistor Q1-Q5 S8050 5
9 Metal Film Resistor R1,R2,R8,R14,R16 10K 5
10 Metal Film Resistor R3,R4,R15 510K 3
11 Metal Film Resistor R5,R6 1M 2
12 Metal Film Resistor R7 100ohm 1
13 Metal Film Resistor R9,R10,R11,R12,R13 1K 5
14 Button S1 6*6*5mm 1
15 NE555 U1-U3 DIP-8 3
16 CD4011 U4 DIP-14 1
17 PCB 90*46mm 1

See all the images below to get the idea for assembling the kit. You can see the images on Flickr also.

More images of the kit

DIY KIT 46- Metal detector DIY electronic kit

This is yet another metal detector kit for electronics beginners. After assembling the kit, if you take the kit close to a metal, the buzzer will turn on and the LED will flash. The sensitivity of the kit can be adjusted using the potentiometer.

Parameters:
NO. Parameters Value
1 Name Metal detector
2 Operating voltage DC 3-5V
3 Operating current ≤ 40mA
4 Standby current ≤ 5mA
5 Detection depth ≤ 60mm
6 Detection and alarm mode Sound and Light
7 The difficulty of soldering Easy
8 Circuit board size 86*61mm
9 Packing weight 16g/kit

Component list:

NO. PCB Marker Component Name Parameter QTY
1 R3 RES 470R 1
2 R2 RES 2K 1
3 R1 RES 200K 1
4 VR1 ADJ-RES 100R 1
5 C2.C3 CAP 222P 2
6 C1.C4 CAP 104P 2
7 C5 E-CAP 100UF 1
8 LED1 LED 5mm Red 1
9 Q2.Q3 Transistor S9012 2
10 Q1 Transistor S9018 1
11 SW1 Power SW 1
12 SP1 Buzzer 9*12 1
13 J1 Power-Socket KF301-2 1
14 —— PCB MDS-60 1
15 Choose Battery box AA1.5V*3 1

Schematic of the kit:

Click on the images below to see all the assembly steps. You can also see the images on Flickr.

Check out all the images below

Documentation:

MDS-60-Metal-detector-kit

DIY KIT 45- Metal Detector Electronic Kit

This is a simple metal sensor DIY electronic kit for electronics beginners. Use 3V-5V battery and take metal to its proximity, it will activate the buzzer. The kit can detect metals up to 5cm.

Kit parameters:
Supply voltage: 3-5V
Dimensions: 66 * 61MM
Maximum detection range: 5CM

The schematic of the kit is given below:You can see the images below to get tips for assembling the kit. You can find all the images on Flickr also.

Check out these product images also

DIY KIT 43- LM393 based light operated switch with relay

    • This is yet another dark/light sensor project that uses a photoresistor. This kit has an LM393 chip and there is a relay also. It is a light operated switch.
    • 【Great School Science Project】: The light operated switch can be a great school project for children. It is widely used to help students learn basic mechanical and electronic skills. It’s a great Science Fair project. Highly recommended to practice soldering skills for you and your kids.

(more…)

DIY KIT 41- TDA2030A Electronic Mono Audio Power Amplifier Board

TDA2030A is widely used as a Hi-Fi audio amplifier in computer speakers.
It has the current limiter as well as thermal shutdown functions.

Specifications:
Output Power: Maximum 18W
Supply Voltage: DC 9V-24V (recommended DC 12V, this voltage to the heat sink requirements are very low.

The maximum supply of this board is actually up to 40V, but you need to change the board’s electrolytic capacitor C1. The capacitor voltage value should be higher than the supply voltage.
Static Current: about 25mA (disconnect to tone, connect to 8Ω speaker, 12V power supply)
Speaker Impedance: 4Ω-8Ω
Total harmonic distortion: THD 0.08%(Po=0.1 to 14W,RL=4Ω)
SNR: 94dB-106dB(1W-15W)
Heat: The higher the supply voltage, the higher the heat is generated.

Schematic:

Check out all the images to get tips for assembly. You can see all the images on Flickr also.

Other images of the kit

DIY KIT 40 – TDA2822M Audio Amplifier DIY Kit

AMP-1 amplifier uses TDA2822M  as an amplifier chip. This chip is STMicroelectronics (ST) developed dual-channel monolithic power amplifier IC, usually used in the pocket cassette player (WALKMAN), tape recorders and multimedia speaker for the audio amplifier. It has a simple circuit, produces good sound quality, it has a wide voltage range and other characteristics that can work in stereo and bridge amplification (BTL) circuit form. (more…)

DIY KIT 39- Laser operated wireless audio transmitter and receiver

This kit is very much similar to our previous projects. Check out the previous projects first:
The kit package comes with 2 sets of DIY kits. One set is for laser-based music transmitter and the other is the receiver and audio amplifier circuit. The transmitter points the receiver and when the transmitter is connected to the audio source, the audio is transmitted to the laser via laser.
The kit has mono audio signal transmitter and receiver.
 The transmitted audio signal definitely has no wired sound quality, there is a little noise, and the sound is not very loud. It is mainly used for soldering practice and STEM projects.
Parameters:
Transmitter operating voltage: 9-12V (12V emission distance furthest)
Receiver Operating voltage: 5~12V (The higher the voltage, the louder the volume)
Input: MIC input or 3.5 audio input (Automatic switching)
Applications:
1. One-way calling (two-way intercom calls need to buy 2 sets),
2. Mobile phone, mp3 audio transmission.
Schematics are given below:
Transmission distance: It is recommended to be around 5-10 meters. Beyond this, the signal is unstable.
Driving Speaker: 0.5W-10W Speaker
Transmitter Module PCB Size: 1.9* 2.5cm
Receiving module PCB size: 1.7 * 3.9cm
Working principle: The basic principle is to convert the fluctuating sound into the red laser, then the laser vibration signal is received at the photodiode receiver of the receiver circuit, and this signal is demodulated to achieve the sound. The transmission distance can reach about 5-10 meters and can be used to manufacture long-distance wireless speakers.
Common problems:
1. Short transmission distance: The normal transmission distance is more than 10 meters. If the distance is shorter, check if the transmission terminal voltage is too low. If the voltage is lower than 9V, check whether the battery power is sufficient or not. Replace the battery with a new one. You need to adjust the transmission and reception angles, they must be in the same line.
2. There is noise: In normal condition, there is low noise. However, if the noise is too loud, check whether the photosensitive receiver is affected by ambient light, try to avoid the ambient light; 3.5 audio input cable must use high quality shielded cable, otherwise noise will be generated due to interference; the transmitter and receiver must be in the same straight line, otherwise the sound is too small and the noise will overlap the sound.
3. Distorted after the sound is overloaded: Please adjust the audio input volume.
How to assemble the receiver side. You can see these images on Flickr also

How to assemble the transmitter kit. You can see all the images on Flickr also.

All other images of the kit

DIY KIT 38- Sound activated LED lights

This is a very basic electronic DIY kit for electronics beginners. There are few LEDs in the circuit that can be turned on by sound. The larger the sound intensity the more the LEDs glow. There is a microphone in the circuit which is sensitive enough to pick surrounding sounds. (more…)

DIY KIT 36- NE555 and uA741 based monostable trigger learning kit

This is a basic electronics learning kit based on NE555 and uA741. Check out the following images for assembly. You can see all the images on Flickr also.

Other images of the kit:

 

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