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09-17-2018, 10:22 PM
Hi Guys
There are pros and cons for every switching element.
Jfets are inexpensive, require no power to be on or off, and come in a wide variety of capability. For switching, you want low on-resistance and suitable voltage rating for the circuit point. Using them as shunt switches is simple but as series switches they require a bipolar supply, which you may find easy or difficult to employ. The gate control voltage is not 100% isolated from the channel, so a small amount of care must be taken in the placement of parts.
Relays require a bit of power to energise and this current has to come from somewhere. Supplying the coil is usually the biggest hurdle in using relays. otherwise, relays provide negligible on-resistance and near-infinite isolation between poles and to the coil, so the coil control circuit can be at any voltage, as can be the contacts. Relays cost a lot more than jfets regardless of what deals you might come across. The contacts can be configured for series or shunt switching with no effort at all.
Have fun
There are pros and cons for every switching element.
Jfets are inexpensive, require no power to be on or off, and come in a wide variety of capability. For switching, you want low on-resistance and suitable voltage rating for the circuit point. Using them as shunt switches is simple but as series switches they require a bipolar supply, which you may find easy or difficult to employ. The gate control voltage is not 100% isolated from the channel, so a small amount of care must be taken in the placement of parts.
Relays require a bit of power to energise and this current has to come from somewhere. Supplying the coil is usually the biggest hurdle in using relays. otherwise, relays provide negligible on-resistance and near-infinite isolation between poles and to the coil, so the coil control circuit can be at any voltage, as can be the contacts. Relays cost a lot more than jfets regardless of what deals you might come across. The contacts can be configured for series or shunt switching with no effort at all.
Have fun
