| ??? 08/09/07 06:40 Read: times |
#142953 - It's too risky! Responding to: ???'s previous message |
Kai Klaas said:
Richard said:
The temptation to use excessively long wires rather than minimal ones encourages poor construction technique. Which is a disaster on digital boards. Look at the huge loops created by the wires! The radiated noise must be incredibly high. At low frequency it doesn't matter so much, but it does matter. Nevertheless, for an audio frequency project this doesn't matter. If you don't believe me, then open an arbitrary Japanese's consumer electronics device and look at the many many flying wires. I'd guess his oscillator is not at audio frequency. Richard said:
There are too few independent GND (return) paths, which tends to put reference and return on the same path, with "unfortuntate" results. Yes, that's terrible on a digital board. A solid ground plane would help an universe here. Nevertheless, for an audio frequency project this doesn't matter. If you don't believe me, then open an arbitrary Japanese's consumer electronics device and look what they do with signal ground. Sharing reference and current return on the same wires/tracks is disastrous in any analog and most digital circuits, irrespective of frequency. Each time there's a change in current flow, there'll be a corresponding change in the reference potential. Richard said:
Cutting wires to appropriate lengths is too much effort for most users, and makes re-use unlikely. Yes, but what really counts is the lack of solid ground plane here! Yes, and that's why I believe the usefulness of solderless breadboards is limited to lower audio frequency, mostly in the 60 Hz range and below. Richard said:
Individual sockets, particularly on power and GND rails, tend to become looser and looser. Only, if you insert wires that are too thick. Allowed wires will hardly destroy such a spring contact. I have breadboards, that are 30 years old and work like brand new ones. My three breadboards of this type are also about 30 years old and, though they have, between them, been used, perhaps, 10 times, the one that's seen the bulk of this usage doesn't work so well with the clipped resistor leads that I typically prefer. I've used the #22 wires that came with one of these, but find it much more satisfactory to plug DIP packages into wire-wrap sockets and then plug them into the solderless breadboard. That way I'm sure there's good contact with the board and a convenient place to attach and instrument. Richard said:
These solderless breadboards CAN be used, but not as easily and not producing the quality results of wire-wrap or point-to-point soldered circuits. For the audio frequency range I can make a breadboard design where you wouldn't notice the difference to a point-to-point soldered design! It's always a question of how to make it right... Kai I only use then to prove that a regulator or relay driver really works as I expect. Anything with more than a dozen connections or frequencies above a kHz or two deserves a wire-wrapped or point-to-point-soldered construction. Those are quicker to complete and more reliable when finished. RE |
