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G8MNY  > TECH     13.02.19 11:30l 59 Lines 2865 Bytes #7 (0) @ WW
BID : 58992_GB7CIP
Read: GUEST
Subj: Lab PSU
Path: ED1ZAC<ED1ZAC<IZ3LSV<IW0QNL<OK0NBR<SR1BSZ<GB7CIP
Sent: 190213/1023Z @:GB7CIP.#32.GBR.EURO #:58992 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

Here is a circuit from Chrissi ZR6CPB.

  ZR6CPB PRECISION ADJUSTABLE LAB POWER SUPPLY Mark II  Low 3-15V 0-30A
                                                        Hi 15-33V 0-15A
                         +-----------------+----+----+----+----+----+
                         |                 |    |    |    |    |    | /
(Low Voltage)            |TIP3055 or 2N3055| x6 |    |    |    |    | /
(Hi Current)             |               | /c | /  | /  | /  | /  | / /
  |                      |             b |/   |/   |/   |/   |/   |/  /
                         |         +-----+----+----+----+----+----+   /
Low  Off  Hi-(Hi Voltage)|         |     |\   |\   |\   |\   |\   |\  /
  +-------+ (Low Current)|         |     | Ve | V  | V  | V  | V  | V
  |       |              | ------- |       |    |    |    |    |    | h
>-+-o o o-+              | |     | |       |    |    |    |    |    | e
Mains ^                  |  > O <  |       \    \    \    \    \    \ a
Live  |                  | |     | |       /    /    /    /    /    / t
      O  DP3T(Centre Off)| ------- |    0R2\ 0R2\ 0R2\ 0R2\ 0R2\ 0R2\ s
      |  Switch          | |     | |    5W / 5W /  5W/ 5W / 5W / 5W / i
<-----+                  | |L200 | |       \    \    \    \    \    \ n
Transformer Live         | |     | |       |    |    |    |    |    | k
                         | ------- |current|    |    |    |    |    |
                         | 1|||||5 |   1 K |    |    |    |    |    |
                         |  |||||  | /\/\/\+----+----+----+----+----+->
Transformer 12-0-12 15A  |  |||||  |   ^   |    |    |                +
+---------+-+  +---+-----+--+|+|+-++   |   |    |    |
\         | |  |   |     |   |||  |    |   |    |    |         3-33 V
/         | |  |   |     |   ||+  |    |   /    |    |
\ 12V RMS - v  |   |     |   +|--------+   \    |    |         0-30 A
/         ^ _  |   |40V  |50v ||  |        /    |    |
\    Off  | |  |  +|4700u|0.1u||  | voltage\10k |   +| 4700uf
/ Low  Hi | |  | ----- -----  |+---------->/  ---- -----
+--o o o--+ +--+ /---\ -----  |   |        |  ---- /---\ 40V
/ct  ^    | |      |     |    |0.1|uf      |    | 0.1|uf  |
\    |    | | +<36V|     |    | -----      \    |50V |
/    O    v -      |     |    | -----      /1k  |    |
\12V |    _ ^      |     |    |   |50V     \    |    |
/RMS |    | |      |     |    |   |        /    |    |
\    |    | |   -  |     |    |   |        |    |    |                -
+---------+-+   +--+-----+----+---+--------+----+----+---------------->
     |          |
     +----------+
    ---  (ground)
     -
     .

DP3T switch with centre off - selects between LO, OFF & Hi.

Enjoy! From ZR6CPB@ZS0TFK.LIC.NWP.ZAF.AF


Also see my tech bul "0-35V 0-5A Lab PSU CS FL-305".

Why Don't U send an interesting bul?

73 De John, G8MNY @ GB7CIP


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