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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Soldering bypass caps to circuit board.... posted by BobY on September 19, 2000 at 10:13:44:
I agree with Bobwire, sometimes you have to do what you can. I typically solder them to the leads of the electrolytic on the bottom side of the board. However, if you have access to schematics and/or can trace out where the circuit is going, you can often times locate vacant solder pads or remove jumpers to find a clean spot to install the bypass cap.For digital circuits, I like to use X7R ceramic SMD caps. These are tiny and can typically easily be soldered to the leads of the electrolytic. However, many say that it is best to bypass directly, the IC or other source that the main cap is filtering. In the case of PS decoupling caps at IC's, this is commonly easy to do, although delicate work. If you have through-hole IC's, for instance, you can often tack solder the cap from the IC lead to a vacant solder pad on the ground plane nearby. For instance, I found that the high-speed op-amps (LT1364 in this case) do require film bypass caps at their voltage rails to ground. In the case of the LT1364, this mean .1uf Wimas from pins 4 and 8 to ground. This was achieved from the bottom of the board directly from the IC pins to ground.
I hope this helps.
Dan W.
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- Re: Soldering bypass caps to circuit board.... - Dan W 12:21:52 09/19/00 (0)
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