WB2MIC MICHIGAN MIGHTY MITE 500mw/350mw input/output QRPp TRANSMITTER
I saw a circuit schematic for the Michigan Mighty Mite 500 milliwatt QRP transmitter and knew I had the parts to throw one together (minus the XTALS). I threw this version together in a couple of hours and bought/added a switch with two XTALS for 7030 and 7040 KHz.  Circuit is below.  I have worked the stations below in the log so far.  I built this rig today 12/23/09 on the 46th anniversary of getting my first ham novice ticket WN2MIC.
The bug is of unknown manufacture bought at a hamfest many years ago.  It looks to be homebrew?  The variable capacitor is from a defunct AM radio.  The transistor is a 2N2222 from the junk box as are all the other parts.  The form is a spent pill container.  
Schematic
The tank coil is made using a 1.25 inch pill bottle wrapping it typically with #20 - #22 AWG enameled wire. I didn't have any so I simply stripped a length of Ethernet cable and used the insulated wire inside.  

I made L1 for 40 meters by wrapping the wire around the pill bottle 14 turns and then making a 1-inch loop outward twisting it for the tap and then continuing to wrap until completing 21 turns.  This is the primary side. I wrapped the wire tight side-by-side (non-overlapping).

I then wrapped L2 by winding 4 turns over the 14 turns off L1 also side-by-side (non-overlapping).

500mw/350mw input/output QRPp TRANSMITTER QSO LOG
# DATE UTC CALL FREQ BD RS RR MD W ANT QTH WAS
1 091223 13 56 WBGKH 7029.71 40 559 339 CW 0.35 1/4λV WI 1
2 091223 14 18 K2JT 7029.71 40 559 549 CW 0.35 1/4λV NJ 2
3 091223 16 12 N2BHA 7040.02 40 569 339 CW 0.35 1/4λV NY 3
4 091223 16 33 W4PM 7028.85 40 599 569 CW 0.35 1/4λV VA 4
5 091223 17:33 WY3H 7028.85 40 559 229 CW 0.35 1/4λV PA 5
6 091223 18:12 KB3AAG 7030.07 40 559 559 CW 0.35 1/4λV PA
7 091223 19:06 WM8E 7039.83 40 579 559 CW 0.35 1/4λV WV 6
8 091223 19:16 KD8CVS 7030.03 40 579 559 CW 0.35 1/4λV OH 7
9 091224 19:45 N4HCQ 7039.42 40 599 558 CW 0.35 1/4λV VA
10 091224 21:34 WA4KXX 7029.78 40 599 539 CW 0.35 1/4λV AL 8
11 091225 16:01 K3MD 7030.00 40 599 579 CW 0.35 1/4λV PA
12 091225 17:01 KE8LF 7029.96 40 559 339 CW 0.35 1/4λV OH
13 091225 17:15 WM8E 7030.06 40 599 529 CW 0.35 1/4λV WV
14 091225 19:00 WA8VTD 7030.84 40 599 339 CW 0.35 1/4λV MI 9
15 091226 03:27 W2UF 7030.38 40 579 469 CW 0.35 1/4λV NC 10
16 091226 15:30 KE3V 7029.65 40 569 549 CW 0.35 1/4λV PA
17 091226 16:28 WA1JAS 7031.37 40 599 569 CW 0.35 1/4λV ME 11
18 091226 17:57 K3JT 7029.75 40 599 569 CW 0.35 1/4λV WV
19 091227 14:40 KD8CVS 7030.66 40 579 559 CW 0.35 1/4λV OH
20 091227 16:23 N4DR 7030.08 40 559 539 CW 0.35 1/4λV MD 12
21 091227 17:37 K3NCO 7030.08 40 589 559 CW 0.35 1/4λV MD
22 091227 18:59 N3WT 7039.70 40 559 579 CW 0.35 1/4λV MD
23 091230 13:00 W4LZW 7028.96 40 599 229 CW 0.35 1/4λV SC 13
24 091230 13:49 KD8CVS 7039.91 40 579 559 CW 0.35 1/4λV OH
25 091230 17:10 N8ER 7030.01 40 599 549 CW 0.35 1/4λV WV
28 100101 18:41 VE3OU 7030.63 40 589 439 CW 0.35 1/4λV ON
29 100109 15:13 N8XI 7040,04 40 579 599 CW 0.35 1/4λV MI
30 100110 17:47 NM3B 7040.79 40 549 449 CW 0,35 1/4λV PA
31 100118 15:42 W2XB 7030.02 40 599 239 CW 0.35 1/4λV NY
32 100118 18:48 AJ1G/m 7029.89 40 559 559 CW .035 1/4λV CT 14
33 100118 18:54 K4AXF 7029.89 40 559 559 CW 0.35 1/4λV VA
Last update: 100118