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<blockquote data-quote="brian jj" data-source="post: 131175" data-attributes="member: 7783"><p>The philco sn588 is the same as the sprague 2n128 as it is a surface barrier transistor. I did my research on these devices and the last year they were made was in 1975. For harmonics yes a square wave contains many harmonics but doubtful any higher than 1 mhz due to the leakage of the capacitor and design of the 555 timer and especially at low frequencies as this one operates. the best bet would be to use a chip that is designed for turning on and mosfets off. here is a good circuit. it has turn on times lower than 6ns you can use your 555 timer to drive it,</p><p><a href="http://www.ti.com/lit/ds/symlink/ucc27211a-q1.pdf" target="_blank">http://www.ti.com/lit/ds/symlink/ucc27211a-q1.pdf</a></p><p><a href="http://www.ti.com/lit/ds/symlink/ucc27211a-q1.pdf" target="_blank">http://www.ti.com/lit/ds/symlink/ucc27211a-q1.pdf</a></p></blockquote><p></p>
[QUOTE="brian jj, post: 131175, member: 7783"] The philco sn588 is the same as the sprague 2n128 as it is a surface barrier transistor. I did my research on these devices and the last year they were made was in 1975. For harmonics yes a square wave contains many harmonics but doubtful any higher than 1 mhz due to the leakage of the capacitor and design of the 555 timer and especially at low frequencies as this one operates. the best bet would be to use a chip that is designed for turning on and mosfets off. here is a good circuit. it has turn on times lower than 6ns you can use your 555 timer to drive it, [URL='http://www.ti.com/lit/ds/symlink/ucc27211a-q1.pdf'][/URL] [URL]http://www.ti.com/lit/ds/symlink/ucc27211a-q1.pdf[/URL] [/QUOTE]
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