Hi zusammen,
ich suche jemanden, der gut löten kann und mir einen 0805 Widerstand und einen SO-8 IC tauschen könnte. Ich habe leider das passende Werkzeug (Heißluft etc) nicht da und aktuell für diese Anschaffungen nicht die Mittel. Am besten um Bochum herum.
Kann da jemand helfen?
Grüße!
Hi all. I am currently troubleshooting a pcb. It needs a dual supply of +/-5V and I try to derive that from 12V as follows: 12V regulated to 7V (working) and then regulated to 5V. all good. However, I am using a LMC7660 charge pump to invert 7V and then regulate to -5V with L7905. It looks like the opamps draw too much current for the charge pump. It has a 10u electrolytic cap as both pump and reservoir caps.
Now my question is: how can I increase current source capabilities of said charge pump? Use tantalum 100u for Cr and Cp? Or am I completely off and this will never work?
Thanks!
Edit: Thank you for your help. Another problem that led to insight. Hiwever, I will use the LT1054. It was the part I was looking for anyway.