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| To: | <[email protected]> |
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| Subject: | LF: Re: RF ammeter question |
| From: | "Alan Melia" <[email protected]> |
| Date: | Tue, 11 Jan 2011 11:38:52 -0000 |
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Hi John most probably......... the 1N4148 is a fast switching diode whereas the 4007 is intended to rectify at about 1amp, so has a bigger area junction and a lot more capacitance, and probably a longer carrier lifetime. Alan G3NYK ----- Original Message ----- From: "John RABSON" <[email protected]> To: <[email protected]> Sent: Tuesday, January 11, 2011 11:16 AM Subject: LF: RF ammeter question LF, I have built the fullwave rectified version of the design shown on page 10.33 of the RSGB Handbook 10th edition. It reads correctly at 25kHz but only show 1/3 of the correct value at 136. Not having any 1N4148 diodes I used 1N4007s. Might this be the cause of the problem? 73 John F5VLF |
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