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G8MNY > TECH 27.05.07 11:51l 53 Lines 2358 Bytes #999 (0) @ WW
BID : 16231_GB7CIP
Read: GUEST OE7FMI
Subj: 1A Float/charging Pb Acid Batt
Path: DB0FHN<DB0FOR<DB0SIF<DB0MRW<DK0WUE<DB0RES<ON0BEL<7M3TJZ<HG8LXL<CX2SA<
GB7CIP
Sent: 070527/0739Z @:GB7CIP.#32.GBR.EU #:16231 [Caterham] $:16231_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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