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BBox 2

BBox 2

VU Meter (LM3915) – B2P20

The LM3915 is another popular IC that can be used to build interesting circuits. It is designed to drive 10 LEDs depending on the analog voltage signal applied to the input. The LM3915 has an adjustable voltage reference and each of the LEDs represent a 3dB step, this makes it Read more…

By frenoy, 10 months10 months ago
BBox 2

Bluetooth Speaker System (Audio Blobs) – B2P19

Building a Bluetooth speaker from the ground-up is a challenging task, but thankfully, we have pre-programmed modules that can be used to make it much simpler. We will use one such Bluetooth audio module to build a Bluetooth speaker. The BBox 2 contains two modules called blobs, which further simplifies Read more…

By frenoy, 10 months10 months ago
BBox 2

Voice Recorder (ISD1820) – B2P18

We will now use the ISD1820 IC to build a voice recorder. The ISD1820 is a dedicated voice recorder IC and we will be using the reference circuit contained in the datasheet. The ISD1820 works at a maximum of 3.3V, so make sure you connect the right voltage output before Read more…

By frenoy, 10 months10 months ago
BBox 2

Combination Lock (XOR + NOR Gates) – B2P17

We will now look at two new logic gates and we will use them to create an extremely basic combination lock. The 74HC86 consists of 4 XOR gates which have 2 inputs each. The output of an XOR gate is LOW when both the inputs are the same (either HIGH Read more…

By frenoy, 10 months10 months ago
BBox 2

LED Heartbeat Circuit (LM358) – B2P16

The heartbeat or breathing circuit is a nice little LED project that makes use of a relatively simple circuit. We’ve used the LM358 op-amp in the previous project and to quickly recap: it’s an analog device whose output is the difference between the voltages at its two input terminals. Transistor Read more…

By frenoy, 10 months10 months ago
BBox 2

Electronic Candle Circuit (555 + LM358) – B2P15

We’re going to now build an electronic candle using a 555 timer and an op-amp. To give us a candle-like effect, we will be using a flicker LED which has two terminals and can be used as a standard LED. This is what the schematic looks like. We configure the Read more…

By frenoy, 10 months10 months ago
BBox 2

Reaction Timer Circuit (555 + 4026) – B2P14

We’re now going to look at two new components – the CD4026 counter and the 7-segment display and we’re going to use them to build a simple reaction timer circuit. A 7-segment display is nothing but 7 LEDs grouped and arranged in figure 8 along with another LED that acts Read more…

By frenoy, 10 months10 months ago
BBox 2

LED Roulette Circuit (555 + 4017) – B2P13

Another interesting circuit that can be built using the binary counter is a roulette like LED wheel. It’s pretty much based on the same principle as before so let’s take a look at the schematic. The 4017 is used like before but we add a total of 10 LEDs which Read more…

By frenoy, 10 months10 months ago
BBox 2

Electronic Dice Circuit (555 + 4017) – B2P12

A binary counter can be used to create some interesting circuits and an electronic dice is one of them. The circuit is very similar to the previous one so let’s start by taking a look at the schematic. We have a 555 timer configured in the astable mode, but instead Read more…

By frenoy, 10 months10 months ago
BBox 2

LED Runner Circuit (555 + 4017) – B2P11

We will now use a new IC to help us count events. The CD4017 is a binary counter that has 10 output pins. Initially, the first output will be 1, but when a clock pulse is sent to the clock pin, the second output will be a 1, while the Read more…

By frenoy, 10 months10 months ago

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