On 26 Oct 96 (12:15), t96uro@student.hk-r.se wrote:
> Is there any one who knows how build a radio
> transmitter for 70-110 MHz FM?
Yes, me. It's very simple, when you are willing to use a xtal. Modulation can
be done via two BB405B's or similar devices.
VCC
|
|
+-+
| | R1
+-+
|
| | |
+----------+--------| |------------->>
| | | |
XTAL |
| |--+ C1
+-------| T1
| |--+
+-+ |
| | R2 |
+-+ |
| |
_|_ _|_
GND GND
R1 = 470R...2k2 (depending on VCC)
R2 = 1M0
C1 = 4.7pF...68pF
T1 = either BF256A, BF256B or BF245A (other n-channel jfets may be used as
well)
--
Stephan A. Maciej, stephanm@muc.de, "http://www.muc.de/~stephanm/"
Date: 26 Oct 1996 21:54:00 +0100
Original Subject: Re: How to build a radio transmitter