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PARTS LIST — ETI-162

Resistors	.. all '/zW, 5%.unless noted
R1 .............	.. 1k8
R2 .............	. 47R
R3 .............	. . 33R
R4 .............	. 680R
R5 .............	330k
R6. R7 .........	..220R
R8 ............	. . 1R8, IW
R9 ............	. 2R2, 1W
R10 ............	. 27k
RV1 ...........	.. 250k lin. pot
RV2 ...........	.. 5k lin. pot
RV3 ...........	.. 1kmin. vertical mount
RV4 ...........	trimpot . 5k min. vertical mount
Capacitors	trimpot
C1.C2 .........	,.. 2500u/50 V axial electro
C3 .............	... IOOu/25 V RB electro
C4 ............	.. 150n greencap
C5.C8 .........	. . 68p ceramic
C6 ...........	...I00n greencap
C7 ............	. 100p ceramic
C9. C10 ......	. . 10u/35 V RB electro
Semiconductors D1-5, 8. 9 ......	1N4001. 1N4002.
D6-D7.........	1N4004, EM401 etc . . 1N914, 1N4148
IC1 ...........	. , .LM317T.uA317UC
IC2 ...........	. . LM301, uA301
Q1 ...........	. TIP32A. B or C
LED1.2 .......	TIL220R red LED

Now you can tackle the pc board. Start with all the resistors. Then mount the two trimpots. Next, solder all the semiconductors in place. It is most important you get all of these the right way round, especially the rectifier diodes. The capacitors can be mounted next. There are tive electrolytics and all have to be mounted with the correct orientation. Notę that the two filter capacitors are given as 2500 uF in the parts list but the photograph shows 2200 uF types. Either can be used with-out afifecting circuit operation at all. Remember, electrolytic capacitors have a very wide tolerance (like +80%, -20% ). We used pc stakes to terminate the leads from the off-board components. You could use short lengths of 22 gauge tinned copper wire with a loop bent at the top, if you wish. Six 30 mm lengths of tinned copper wire are needed to connect the 317 and TIP32.

Carefully check the pc board to see that all components are mounted and the semiconductors and electrolytics are correctly polarised. Mount the pc board and terminate the flying leads from all the off-board components. Use heavy duty hookup wire from the transformer secondary to the board and from

Misceilaneous

F1 ...............0.5 A, 3AGfuse

M1 ...............ImA MU-45 meter, or

similar

SW1.SW2........DPDT miniaturę toggle

switches, 250 Vac/1 A rated.

T1 ...............6672 transformer, 240 V

primary, 30 V/1 A multi-tapped secondary.

ETI-162 pc board; two binding posts — one red, one black; case — metal, U-chassis & lid type; 184 x 70 x 160 mm (e g: D.S.E. H2744, Altromcs H0444, Electronic Agencies HE 1742); two smali knobs; mains cable, clamp grommet and terminal strip; fuseholder; Scotchcal panel and meter scalę; heatshrmk tubing; heatsmk — fiat sided radial fin type, 30 mm long (e g: Rod lrvmg HS1); nuts, bolts, hookup wire etc.

Price estimate $45 —$50

Notę that this is an estimate only and not a recommended price. A variety of factors may affect the price of a project, such as — quality of components purchased, type of pc board (fibre-glass or phenolic base), type of front panel supplied (if used). etc — whether bought as separate components or madę up as a kit.

the output terminals to the board.

All OK? Check it!

Now you’re ready to switch it on and try it out.    ►

Jk*

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