9VDC Power Supply using Zener diode and Transistor
This Power source can be used to power circuits or electronic devices that would normally use a 9 volt battery, saving us the cost of the battery while being used at home.
Sep 302020
Sep 282020
12v to 24v converter
This 12VDC to 24VDC step up converter is very useful to power devices that run on 24 VDC when we have a 12VDC voltage source as it could be a car battery or alike.
Sep 262020
How to Measure Beta of a Transistor? (β / hfe of transistor)
The beta (β) is a characteristic of each transistor. This feature is found in the NTE, ECG manuals, etc. These manuals have a minimum or approximate values of the real values. This means that we do not know the real value of the transistor.
Sep 262020
Astable multivibrator using NAND gates
This astable multivibrator uses two NAND gates of the 4 available on the 7400 TTL integrated circuit. Two LEDs are used to view the status or logic output of each gate.
Sep 242020
DIAC (Diode for Alternating Current)
DIAC is a bidirectional trigger diode, designed to trigger TRIAC and thyristors. DIAC is a voltage-triggered device
Sep 242020
Music box circuit using a CD4017 decade counter and two 555 timers.
This circuit attempts to emulate the operation of a music box. The maximum number of notes is 10, allowing us to make a simple melody.
Sep 222020
Transformerless Power Supply circuit
This circuit is designed to be connected to a specific circuit because it can give a maximum and minimum possible electric current
Sep 222020
Car Battery Booster Circuit
This Car Battery Booster Circuit, is very useful when the car battery has low charge or does not deliver the expected current to operate the starter motor.
Sep 162020
Transistorized Voltage Regulator Why use a transistorized voltage regulator? If we use a half or a full-wave rectifier we can convert an AC voltage in a DC one. This converted voltage is unregulated, because the output voltage is not constant and can change due to variations of the load value. To reduce these variations we connect […]
Sep 162020
Automatic night light circuit with one LED
This automatic night light circuit with an LED is simple, interesting and very easy to do. The circuit allows a better understanding of the operation of a phototransistor and thus be able to use it in other applications.
Sep 132020
Current Limiter for Voltage Regulator using Transistor
If the current required in the load exceeds the maximum allowed, the voltage regulator can be damaged. To avoid this problem it is necessary to have over current protection.
Sep 122020
Multitone generator circuit / Open door indicator using CD4001
This very simple multitone generator circuit has many applications but here it is shown as door indicators, generating a different tone for each door of our house