Ramsey Electronics TT1 Instruction Manual - page 10
TT1
• 10
Now, let's get building!
Since you may appreciate some “warm-up” soldering practice as well as
a chance to put some “landmarks” on the PC board, we’ll first install some
“hardware” components. This will also help us to get acquainted with the up -
down, left - right orientation of the circuit board. Remember that the
components will be mounted on the “component” side of the circuit board
and soldered on the “solder” side of the circuit board.
1. Identify and install DPDT switch S1. Be sure to push the switch
flat to the circuit board. Solder all six connections.
2. Install switch S2, same as in step 1.
3. Install the modular phone jack J1.
We’ll now begin by constructing the tape recorder control section of
the TT1.
4. Install R3, 4.7M ohm[yellow-violet-green].
5. Install R5, 4.7M ohm[yellow-violet-green].
6. Install D2, 1N4148 type small signal diode (glass body with black
band). Install it with the cathode band as shown as these diodes are
polarity sensitive and must be installed in the correct direction.
7. Install D3, 1N4148 same as in step 6.
8. Install D4, 1N4148 same as in step 6.
9. Install D5, 1N4148 same as in step 6.
10. Install R4, 470K ohm [yellow-violet-yellow].
12. Install Q4 a 2N3904 NPN transistor. When installing Q4, observe
correct placement of the flat side. Press the transistor snugly into the
PC board so that only a minimum amount of wire lead is exposed above
the board. In soldering, do not be afraid of using enough heat to make a
good solid connection.
13. Install Q2, 2N3904 same as in step 12.
14. Install Q3, 2N3904 same as in step 12.
15. Install R1, 100K ohm [brown-black-yellow].
16. Install R2, 47K ohm [yellow-violet-orange].
17. Install Q1, 221334 PNP transistor [reviewing step 12].
18. Install D1, 1N4148 diode [reviewing step 6].
19. Install P1, 2.5mm tape recorder “REMOTE” plug cable (see figure on