4 bc639 transistors are used in fan speed control circuit and speed can be adjusted with 47k trimpot on the circuit. Intel CPU fan used in circuit tests is a low cost simple circuit for begi... Read more
There are 41 applications on TTL digital doors. I am thankful to our readers, S.Demirhan(sdmh), who brought the file to me . Many of the circuits have been tested and Vocational High School... Read more
19V 3.34 Ampere Laptop adapter diagram The Dell PA-12 model is used for a wide range of models, but the exact 19 volt is a standard value for many models with 3.34 amps low configuration. Th... Read more
Philips’ IC Type TEA 104 1T is ideal for monitoring the voltage of 1.8_4.0 V batteries. Internal trigger and timing logic prevent a circuit from reacting to brief breaks in the supply... Read more
The capacity tester will give an 11.‘j accurate indication of the capacity of up to six NiCd (nickel-cadmium) batteries connected in series. It is very useful for monitoring the aging proces... Read more
Car battery voltage monitor: The monitor uses a two-digit 7- ‘ segment LED display to indicate the battery voltage. In addition to this, there are ‘low’ and ‘high... Read more
To make sure that a lead-acid battery (whether standard or sealed) is always fully charged, a constant voltage should be applied to it. Chargers that check whether the battery is still charg... Read more
Various types of dry and rechargeable battery (with an e.m.f. of ≤2.7) can be tested with the circuit shown in the diagram below. It is based on the well-known Type LM 3914 LED display drive... Read more