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G8MNY  > TECH     30.06.06 08:07l 53 Lines 2353 Bytes #999 (0) @ WW
BID : 36473_GB7CIP
Read: DL1LCA GUEST
Subj: 1A Float/charging Pb Acid Batt
Path: DB0FHN<DB0FOR<DB0SIF<DB0SON<DB0ERF<DB0SHL<DB0MW<DB0SWR<DK0WUE<I0TVL<
      CX2SA<GB7YFS<GB7CIP
Sent: 060630/0009Z @:GB7CIP.#32.GBR.EU #:36473 [Caterham] $:36473_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To  : TECH@WW

By G8MNY                                            (Updated Oct 05)
(8 Bit Graphics use code page 437 or 850)
Here are 2 simply circuits for small discharge current batteries.

1/                On Insulated Heatsink
                      in ÚÄÄÄÄÄÄÄ¿out            1N4001
       +24V >ÄÄÂÄÄÄÄÄÄÄÄÄ´ 7805  ÃÄÄÄÄÂÄÄÄÂÄÄÄÄÂÄÄ´>ÃÄÂÄÄ> +14.5V BOOST
               ³         ÀÄÄÄÂÄÄÄÙ    ³   e\³ 22k     ³    +13.5V NORMAL
RAW DC   >2200u³+        com_³_       ³  PNPÃÄÄÁÄÄ10kÄÙ
FROM       30V===           /_\`    u1³    /³
BRIDGE         ³  NORMAL ____³ 9.1V  ===  ³               Battery being
RECTIFIER      ³        O   _³_       ³  1k              floated/charged
& 17V AC       ³ BOOST \o   \_/ 0.5V  ³  _³_-> Charge
@ 1.5A         ³        ³   _³_       ³  \_/-> LED
               ³        ³   \_/ 0.5v  ³   ³
      0V >ÄÄÄÄÄÁÄÄÄÄÄÄÄÄÁÄÄÄÄÁÄÄÄÄÄÄÄÄÁÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄ>0v

Voltage set by Zener + Reg - O/P diode loss. 13.5V recommended for floating Gel
& sealed types. 13.8V for wet ones tha can be topped up. 14.5V for charging
after discharge but not left on that voltage.

Current is limited to a peak of 1A. With no I/P smoothing C there will be hum
on the charging current & the battery voltage may not be suitable for floating
with electronic loads. The O/P diode & lets the PNP light the LED when the
diode has 0.7V across it. The diode also proctects the regulator from reverse
voltage is the PSU is off when connected to a live battery.

2/ Add a series R in the common leg. Most makes of regulator put about 50uA
constant current down the common leg, so a small R can uplift the voltage.

                 On Insulated Heatsink
                   in ÚÄÄÄÄÄÄÄ¿out     1N4001
      +22V >ÄÄÄÂÄÄÄÄÄÄ´ 7812  ÃÄÄÂÄÄÄÄÄÄÄ´>ÃÄÄÄ>
RAW DC         ³      ÀÄÄÄÂÄÄÄÙ  ³
FROM     >2200u³+      com³    u1³
BRIDGE     30V===  Multi 10k    ===      Variable O/P
RECTIFIER      ³     Turn ³      ³        Voltage
               ³          ³      ³
        0V >ÄÄÄÁÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄ>

I have used this one for many years to float my paket station on a 5AH gel cell
battery. Via a fused lead it powers a PacCom TNC220, a FT290R(i), & 30W PA,
peak Tx current 8A, Rx 500mA leaving just 500mA to charge for the short packet
Tx time.


Why Don't U send an interesting bul?

73 De John, G8MNY @ GB7CIP


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