Member Since: October 26, 2010

Country: United States

  • This page: http://www.empf.org/empfasis/jan05/lfaudit.htm seems to indicate that a dull finish is normal for lead free solders. If it gets grainy it may be getting too hot.
    I haven't tried this solder, but I find that if I spend too much time on a joint, and the flux "cooks out" of the solder, then it does look a bit grey and "off" looking compared to a really nice one. Maybe if your iron was on the hot side, you would need to work a bit quicker, but 300 C shouldn't be too hot. And remember, heat the work, not the solder. If you are heating both at the same time, you are much more likely to burn up your flux. I'm not a professional, but I when doing PCB's, I heat the pin and the contact around it first, and when it gets hot enough, I just give it a light tap with my (rosin-core, lead containing) solder, and a small amount instantly flows around the hole and pin.
    For the record, I use the old solder for personal projects, especially radio repair. It's a bit taboo to mix solder types in a radio, especially when the old radios contain much more toxic things than lead, and you want to heat these components as little as possible.

  • Just a note: using the 12 volt 600 mA wall adapter below, the max voltage out (peak to peak, sine wave) is approximately 4.7 V, over most of the frequency range but the voltage drops nearing the top of the range. I'm getting about 31 Hz to 700 kHz. Does anyone have some numbers for a higher voltage supply?