carlosthejackle2001
New Member
Hi
I've been working on my project for a while now and have got the infra red link to work.. thanks to help from people on here....
My new problem is with two capacitors.
If you have a look at this datasheet:
https://www.electro-tech-online.com/custompdfs/2004/04/LS7225_26.pdf
the last circuit. There is a 4.7uF (electrolytic?) capacitor that when a key is pressed should charge up and hold the voltage high for a period of time untill it discharges at pin 11, so while it is high the rest of the unlocking code can be inputed. The problem is as soon as i release the key the voltage goes low - i think the capacitor isn't charging or im not using the correct one?? im using a 4.7uF electrolytic capacitor at 63V the circuit is running from a 5 volt supply.
The other capacitor im unsure about is the one between the supply and gnd.. the datasheet doesn't show any values, what kind of capacitor should i be using if one is essential here.
Any help here would be much appreciated thanks
Carl
I've been working on my project for a while now and have got the infra red link to work.. thanks to help from people on here....
My new problem is with two capacitors.
If you have a look at this datasheet:
https://www.electro-tech-online.com/custompdfs/2004/04/LS7225_26.pdf
the last circuit. There is a 4.7uF (electrolytic?) capacitor that when a key is pressed should charge up and hold the voltage high for a period of time untill it discharges at pin 11, so while it is high the rest of the unlocking code can be inputed. The problem is as soon as i release the key the voltage goes low - i think the capacitor isn't charging or im not using the correct one?? im using a 4.7uF electrolytic capacitor at 63V the circuit is running from a 5 volt supply.
The other capacitor im unsure about is the one between the supply and gnd.. the datasheet doesn't show any values, what kind of capacitor should i be using if one is essential here.
Any help here would be much appreciated thanks
Carl