{"id":49,"date":"2006-09-11T19:53:21","date_gmt":"2006-09-11T23:53:21","guid":{"rendered":"https:\/\/www.bumc.bu.edu\/ftms\/research\/rfoscillator\/"},"modified":"2012-07-29T00:33:46","modified_gmt":"2012-07-29T04:33:46","slug":"rfoscillator","status":"publish","type":"page","link":"https:\/\/www.bumc.bu.edu\/ftms\/research\/rfoscillator\/","title":{"rendered":"RF Oscillator"},"content":{"rendered":"
\n

A High Voltage RF Oscillator for Driving Multipole Ion Guides<\/strong><\/p>\n

1. Abstract<\/a>.<\/p>\n

2. Advantages<\/a>.<\/p>\n

3. Circuit diagrams<\/a>.<\/p>\n

4. Citation<\/a>.<\/p>\n

5. Note: obsolete part substitute<\/a>.<\/p>\n

\n

<\/a>Abstract:<\/strong><\/p>\n

A high voltage RF oscillator circuit has been designed and constructed for driving multipole ion guides. The circuit is tunable from 500 kHz to 1.5 MHz by changing a capacitor and provides 0-1000 Vpp that is controlled by a 0-10 V input using a negative feedback circuit. This inexpensive circuit uses a set of high voltage transistors oscillating in tandem and does not require tuning of the resonance drive frequency as the oscillator automatically resonates at the (LC)-1\/2 frequency. Matrix-Assisted Laser Desorption\/Ionization \u2013 Fourier Transform Mass Spectrometry mass spectra were acquired using this tunable RF oscillator circuit to allow transmission of protein ions in the 8.5-39 kDa range through the quadrupole ion guide from the ion source to the mass analyzer.<\/p>\n

<\/a>Net advantages:<\/strong><\/p>\n

1. It’s self tuning. No need to tune to the resonance frequency.<\/p>\n

2. Simple control: 0-10 V input = 0-1000 Vpp output.<\/p>\n

3. Resonance frequency is controlled by changing a capacitor.<\/p>\n

4. It’s cheap. Should cost <$200 in parts.<\/p>\n

 <\/p>\n

<\/a>Circuit diagrams:<\/strong><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

 <\/p>\n

<\/a>Citation:<\/strong><\/p>\n

O’Connor, P. B.; Earle, W. E.; Costello, C. A. A High Voltage RF Oscillator for Driving Multipole Ion Guides J. Am. Soc. Mass Spectom.<\/em> 2002<\/strong>, 13<\/em>, 1370-1375. Link<\/a><\/p>\n

note: if you can’t download the paper, please email me<\/a> and I will send you the pdf file.<\/p>\n

<\/a>Notes:<\/strong><\/p>\n

As is unfortunately very common in the electronics industry, the primary transistor oscillator that is used in this circuit, the Panasonic 2SC5392 has gone obsolete. A substitute is BUH51 from ON Semiconductor, we have tested this replacement and fabricated PCBs for the RF oscillator circuit.<\/p>\n

To download the PCB layout files with the bill of material for the RF oscillator click here.<\/a><\/p>\n

 <\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

A High Voltage RF Oscillator for Driving Multipole Ion Guides 1. Abstract. 2. Advantages. 3. Circuit diagrams. 4. Citation. 5. Note: obsolete part substitute. Abstract: A high voltage RF oscillator circuit has been designed and constructed for driving multipole ion guides. The circuit is tunable from 500 kHz to 1.5 MHz by changing a capacitor […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":41,"menu_order":11,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.bumc.bu.edu\/ftms\/wp-json\/wp\/v2\/pages\/49"}],"collection":[{"href":"https:\/\/www.bumc.bu.edu\/ftms\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.bumc.bu.edu\/ftms\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.bumc.bu.edu\/ftms\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bumc.bu.edu\/ftms\/wp-json\/wp\/v2\/comments?post=49"}],"version-history":[{"count":1,"href":"https:\/\/www.bumc.bu.edu\/ftms\/wp-json\/wp\/v2\/pages\/49\/revisions"}],"predecessor-version":[{"id":1018,"href":"https:\/\/www.bumc.bu.edu\/ftms\/wp-json\/wp\/v2\/pages\/49\/revisions\/1018"}],"up":[{"embeddable":true,"href":"https:\/\/www.bumc.bu.edu\/ftms\/wp-json\/wp\/v2\/pages\/41"}],"wp:attachment":[{"href":"https:\/\/www.bumc.bu.edu\/ftms\/wp-json\/wp\/v2\/media?parent=49"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}