i have 3.3 v voltage regulator module using LM317. i want switch the output through external voltage using BC557/BC547 transistor, because i get output when external voltage is high. get zero output when external voltage is low. please help to make ...
To power on the module you just need to regulate your 5 V source to 3.3 V (with a lm317, lm7833 or other regulator), but the TX pin that came from the PIC microcontroller have 5 V as high logic level, so we need a voltage divider to decrease the 5 V to 3.3 V, this will dri...
If you can't find an NES from any of the above sources, then you have to resort to eBay. Try to look for one with a case that's in bad shape. We will be taking the board out, so the condition of the case is not relevant. Also, try to find a seller that is in your country...
You may add capacitors to the LM338 IC to improve its performance and maintain the power stable. Connect one capacitor to the input of each LM338 and a second capacitor to the ground pin of the devices. Connect another capacitor to the output of each LM338 and the ground pin of the dev...
For LM317, LM338, LM350, LM396, the ADJ pin functions as the shutdown pin, again the NPN module would work with these devices for the desired current restrictions. Integrating with IC 4017/IC4060 ICs such as 4060, 4017 may be stopped from functioning by applying a positive reset voltage...
The circuit is being used as a current booster, the current being the supply to the transmitter and dependent on the voltage it produces. The LM317 always tries to keep 1.25V between it’s output pin and “adj” pin but where we benefit here is the current at the “adj” pin is very...
to operate. So, it is strongly suggested that an external power source should be used to get the desired voltage with sufficient current. A battery is a good option to use as external source otherwise a constant power source like LM317 would be great to use. It must be made sure ...
The main component in a variable power supply is any regulator whose output can be adjusted using any means like a variable resistor. Regulator ICs like LM317 provide a adjustable voltage from 1.25 to 30V. Another way is using LM33 IC. ...